Cultivate an intellectual habit of subordinating one's opinions and wishes to objective evidence and a reverence for things as they really are.

Hypothesis is a toll which can cause trouble if not used properly. We must be ready to abandon our hypothesis as soon as it is shown to be inconsistent with the facts.

Paradoxical as it may at first appear, the fact is that, as W. H. George has said, scientific research is an art, not a science.

Elaborate apparatus plays an important part in the science of to-day, but I sometimes wonder if we are not inclined to forget that the most important instrument in research must always be the mind of man.

No one believes an hypothesis except its originator but everyone believes an experiment except the experimenter. Most people are ready to believe something based on experiment but the experimenter knows the many little things that could have gone wrong in the experiment.

Many discoveries must have been stillborn or smothered at birth. We know only those which survived.

When adults first become conscious of something new, they usually either attack or try to escape from it ... Attack includes such mild forms as ridicule, and escape includes merely putting out of mind.