...any belief in supernatural creators, rulers, or influencers of natural or human process introduces an irreparable split into the universe, and prevents us from grasping its real unity. Any belief in Absolutes, whether the absolute validity of moral commandments, of authority of revelation, of inner certitudes, or of divine inspiration, erects a formidable barrier against progress and the responsibility of improvement, moral, rational, and religious.

To speculate without facts is to attempt to enter a house of which one has not the key, by wandering aimlessly round and round, searching the walls and now and then peeping through the windows. Facts are the key.

Evolution... is the most powerful and the most comprehensive idea that has ever arisen on Earth.

Sooner or later, false thinking brings wrong conduct.

...it is curiosity, initiative, originality, and the ruthless application of honesty that count in research- much more than feats of logic and memory alone.

How unfortunate for mankind that the Lord is reported by Holy Writ as having said 'Vengeance is mine!'

Evolution is nothing but matter become conscious of itself.