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“The fact that a human nose (use the letter X to symbolise the nose) is a necessary condition for spectacles to be perched in front of the eyes (use the letter Y to symbolise ‘spectacles being perched in front of the eyes’) does not entail that, because Y is the case, X is in itself necessary. ‘Necessity’ in the logical sense of ‘having to be so’ is not the same thing as the necessity involved in a ‘necessary condition’ – here things have to be so only relative to something else’s being the way it is. In the case of X’s being a necessary condition relative to Y, but not in itself necessary, X could have been different, and if it were so, there would, or at least might, be no Y. For example: if humans did not have noses, spectacles might be worn as goggles are, held before the eyes by an elastic strap. This is just how it is with the universe. We humans are the Y of which nature’s parameters are the X. We exist because the parameters are as they are; had they been different, we would not be here to know it. The fact that we exist because of how things happen to be with the universe’s structure and properties entails nothing about design or purpose. Depending on your point of view, it is just a lucky or unlucky result of how things happen to be. The universe’s parameters are not tuned on purpose for us to exist. It is the other way round: we exist because the laws happen to be as they are” — A.C. Grayling