It is as fatal as it is cowardly to blink facts because they are not to our taste.

The brightest flashes in the world of thought are incomplete until they have been proved to have their counterparts in the world of fact.

Charles Darwin, the Abraham of scientific men - a searcher as obedient to the command of truth as was the patriarch to the command of God.

The mind of man may be compared to a musical instrument with a certain range of notes, beyond which in both directions we have an infinitude of silence.