Innocent, unbiased observation is a myth.

I reckon that for all the use it has been to science about four-fifths of my time has been wasted, and I believe this to be the common lot of people who are not merely playing follow-my-leader in research.

An experiment not worth doing is not worth doing well.

The case I shall find evidence for is that when literature arrives, it expels science.

[A certain class of explanations in science are] analgesics that dull the ache of incomprehension without removing the cause.

The human mind treats a new idea the same way the body treats a strange protein; it rejects it.

If a person is A) poorly, B) receives treatment intended to make him better, and C) gets better, then no power of reasoning known to medical science can convince him that it may not have been the treatment that restored his health.