The only true wisdom is in knowing you know nothing.
Refusal to believe until proof is given is a rational position; denial of all outside of our own limited experience is absurd.
Natural science does not simply describe and explain nature: it is part of the interplay between us and nature.
Anything that gives us new knowledge gives us an opportunity to be more rational.
The whole of science is nothing more than a refinement of everyday thinking.
Never mistake motion for action.
The intuitive mind is a sacred gift And the rational mind is a faithful servant.
Nothing that is worth knowing can be taught.
A man who dares to waste one hour of time has not discovered the value of life.
The whole difference between construction and creation is exactly this: that a thing constructed can only be loved after it is constructed; but a thing created is loved before it exists.