Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality.

A principle is the expression of perfection, and as imperfect beings like us cannot practise perfection, we devise every moment limits of its compromise in practice.

When you put money directly to a problem, it makes a good headline. It makes a good campaign slogan. You get to claim that you've engaged in these activities within an election cycle. But certain investments take longer than an election cycle.

Truth, like light, blinds. Falsehood, on the contrary, is a beautiful twilight that enhances every object.

The best and safest method of philosophizing seems to be first to inquire diligently into the properties of things, and establishing those properties by experiments, and then to proceed more slowly to hypotheses for the explanation of them.