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“I think that we shall have to get accustomed to the idea that we must not look upon science as a 'body of knowledge,' but rather as a system of hypotheses; that is to say, as a system of guesses or anticipations which in principle cannot be justified, but with which we work as long as they stand up to tests, and of which we are never justified in saying that we know they are 'true' or 'more or less certain' or even 'probable.'”

“It is really laughable to see what different ideas are prominent in various naturalists' minds, when they speak of 'species'; in some, resemblance is everything and descent of little weight-in some, resemblance seems to go for nothing, and Creation the reigning idea-in some, descent is the key,-in some, sterility an unfailing test, with others it is not worth a farthing. It all comes, I believe, from trying to define the undefinable.”

“It's becoming clear that in a sense the cosmos provides the only laboratory where sufficiently extreme conditions are ever achieved to test new ideas on particle physics. The energies in the Big Bang were far higher than we can ever achieve on Earth. So by looking at evidence for the Big Bang, and by studying things like neutron stars, we are in effect learning something about fundamental physics.”

“Those who actually set out to see the fall of a city or those who choose to go to a front line, are obviously asking themselves to what extent they are cowards. But the tests they set themselves - there is a dead body, can you bear to look at it? - are nothing in comparison with the tests that are sprung on them. It is not the obvious tests that matter (do you go to pieces in a mortar attack?) but the unexpected ones (here is a man on the run, seeking your help - can you face him honestly?).”

“The worst sinners, according to Jesus, are not the harlots and publicans, but the religious leaders with their insistence on proper dress and grooming, their careful observance of all the rules, their precious concern for status symbols, their strict legality, their pious patriotism... the haircut becomes the test of virtue in a world where Satan deceives and rules by appearances.”

“When you're operating on uninvestigated theories of what's going on and you aren't even aware of it, you're in what I call "the dream." Often the dream becomes troubling; sometimes it even turns into a nightmare. At times like these, you may want to test the truth of your theories by doing The Work on them. The Work always leaves you with less of your uncomfortable story. Who would you be without it? How much of your world is made up of unexamined stories? You'll never know until you inquire.”

“The true test of one's commitment to liberty and private property rights doesn't come when we permit people to be free to do those voluntary things with which we agree. The true test comes when we permit people to be free to do those voluntary things with which we disagree.”

“We may discover resources on the moon or Mars that will boggle the imagination, that will test our limits to dream. And the fascination generated by further exploration will inspire our young people to study math, and science, and engineering and create a new generation of innovators and pioneers.”

“All Science is necessarily prophetic, so truly so, that the power of prophecy is the test, the infallible criterion, by which any presumed Science is ascertained to be actually & verily science. The Ptolemaic Astronomy was barely able to prognosticate a lunar eclipse; with Kepler and Newton came Science and Prophecy.”

“Twenty centuries of 'progress' have brought the average citizen a vote, a national anthem, a Ford, a bank account, and a high opinion of himself, but not the capacity to live in high density without befouling and denuding his environment, nor a conviction that such capacity, rather than such density, is the true test of whether he is civilized.”

“The fundamental problem in the origin of species is not the origin of differences in appearance, since these arise at the level of the geographical race, but the origin of genetic segregation. The test of species-formation is whether, when two forms meet, they interbreed and merge, or whether they keep distinct.”

“I therefore took this opportunity and also began to consider the possibility that the Earth moved. Although it seemed an absurd opinion, nevertheless, because I knew that others before me had been granted the liberty of imagining whatever circles they wished to represent the phenomena of the stars, I thought that I likewise would readily be allowed to test whether, by assuming some motion of the Earth's, more dependable representations than theirs could be found for the revolutions of the heavenly spheres.”

“It is easy to obtain confirmations, or verifications, for nearly every theory-if we look for confirmations. Confirmations should count only if they are the result of risky predictions... A theory which is not refutable by any conceivable event is non-scientific. Irrefutability is not a virtue of a theory (as people often think) but a vice. Every genuine test of a theory is an attempt to falsify it, or refute it.”

“All interpretations made by a scientist are hypotheses, and all hypotheses are tentative. They must forever be tested and they must be revised if found to be unsatisfactory. Hence, a change of mind in a scientist, and particularly in a great scientist, is not only not a sign of weakness but rather evidence for continuing attention to the respective problem and an ability to test the hypothesis again and again.”

“Richard Feynman was fond of giving the following advice on how to be a genius. You have to keep a dozen of your favorite problems constantly present in your mind, although by and large they will lay in a dormant state. Every time you hear or read a new trick or a new result, test it against each of your twelve problems to see whether it helps. Every once in a while there will be a hit, and people will say, "How did he do it? He must be a genius!"”

“Every great advance in science has issued from a new audacity of imagination. What are now working conceptions, employed as a matter of course because they have withstood the tests of experiment and have emerged triumphant, were once speculative hypotheses.”

“There is one experiment which I always like to try, because it proves something whichever way it goes. A solution of iodine in water is shaken with bone-black, filtered and tested with starch paste. If the colorless solution does not turn the starch blue, the experiment shows how completely charcoal extracts iodine from aqueous solution. If the starch turns blue, the experiment shows that the solution, though apparently colorless, still contains iodine which can be detected by means of a sensitive starch test.”

“The mathematician's patterns, like the painter's or the poet's must be beautiful; the ideas, like the colours or the words must fit together in a harmonious way. Beauty is the first test: there is no permanent place in the world for ugly mathematics.”

“Mind is elusive, you cannot hold it in your hand. You cannot force it into a test-tube. The only way to know it is to know it from within, from your witnessing self. The more you become aware, the more you can watch your mind - its subtle functioning. The functioning is tremendously complex and beautiful. Mind is the most complex phenomenon on the earth, the most subtle flowering of consciousness. If you want to really understand what the mind is, then you will have to detach yourself from your mind, and you will have to learn how to be just a witness. That's what meditation is all about.”

“I feel that, in a sense, the writer knows nothing any longer. He has no moral stance. He offers the reader the contents of his own head, a set of options and imaginative alternatives. His role is that of a scientist, whether on safari or in his laboratory, faced with an unknown terrain or subject. All he can do is to devise various hypotheses and test them against the facts.”

“America you are beautiful . . . and blessed . . . . The ultimate test of your greatness is the way you treat every human being, but especially the weakest and most defenseless. If you want equal justice for all and true freedom and lasting peace, then America, defend life.”

“The ultimate test of a man's conscience may be his willingness to sacrifice something today for future generations whose words of thanks will not be heard.”

“A criminal trial is like a cultural in-flight test in which society projects its own history, fears, impatience, insolence, clemency, insecurities, dreams and nightmares upon facts. ... What's inside is every fairy-tale monster, a brutal ogre, a bloodthirsty werewolf, an elegant vampire, a scheming devil, a bullying giant, a sneering troll, or maybe just an abusive stepfather.”

“To be true to one's self is the ultimate test in life. To have courage and the sensitivity to follow your hidden dreams and stand tall against the odds that are bound to fall in your path. Life is too short and precious to be dealt with in any other fashion. This thought I hold dear to my heart and I always try to be true to myself and others that I encounter along the way.”