“There is hardly anything that an ingenious mind cannot bring itself to doubt, granted sufficient industry and application.” MindDoubtIndustryGrantedSufficientApplicationIngenious Author:Frances Noyes Hart
“For only when our arms are sufficient beyond doubt can we be certain beyond doubt that they will never be employed.” CertainDoubtArmsSufficientEmployedArms RaceInauguralInaugural AddressArmed Forces Day Author:John F. Kennedy
“However we select from nature a complex [of phenomena] using the criterion of simplicity, in no case will its theoretical treatment turn out to be forever appropriate (sufficient).... I do not doubt that the day will come when [general relativity], too, will have to yield to another one, for reasons which at present we do not yet surmise. I believe that this process of deepening theory has no limits.” BelieveReasonTurnsI BelieveProcessCasesForeverDoubtAtheismTheoryLimitsComplexesSimplicityPositive AtheismSufficientAppropriateTreatmentYieldTheoreticalCriteriaSelectRelativityGeneral Relativity Author:Albert Einstein
“... moral certainty is certainty which is sufficient to regulate our behaviour, or which measures up to the certainty we have on matters relating to the conduct of life which we never normally doubt, though we know that it is possible, absolutely speaking, that they may be false.” KnowsMayMatterMoralDoubtCertaintySufficientBehaviour Author:Rene Descartes