The utmost extent of man's knowledge, is to know that he knows nothing.

We own almost all our knowledge not to those who have agreed but to those who have differed.

Zeal will do more than knowledge.

The animals that depend on instinct have an inherent knowledge of the laws of economics and of how to apply them Man, with his powers of reason, has reduced economics to the level of a farce which is at once funnier and more tragic than Tobacco Road.

We can't have full knowledge all at once. We must start by believing then afterwards we may be led on to master the evidence for ourselves.