The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.

It is undesirable to believe a proposition when there is no ground whatever for supposing it true

There is something feeble and a little contemptible about a man who cannot face the perils of life without the help of comfortable myths.

The most essential characteristic of scientific technique is that it proceeds from experiment, not from tradition. The experimental habit of mind is a difficult one for most people to maintain; indeed, the science of one generation has already become the tradition of the next

If we were all given by magic the power to read each other's thoughts, I suppose the first effect would be to dissolve all friendships.

To avoid the various foolish opinions to which mankind are prone, no superhuman genius is required. A few simple rules will keep you, not from all error, but from silly error.

Right conduct can never, except by some rare accident, be promoted by ignorance or hindered by knowledge.