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.

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.

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.

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.

The Imagination merely enables us to wander into the darkness of the unknown where, by the dim light of the knowledge we carry, we may glimpse something that seems of interest. But when we bring it out and examine it more closely it usually proves to be only trash whose glitter had caught our attention. Imagination is at once the source of all hope and inspiration but also of frustration. To forget this is to court despair.

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.

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