Every philosophy is tinged with the coloring of some secret imaginative background, which never emerges explicitly into its train of reasoning.

The study of mathematics is apt to commence in disappointment.

In modern times the belief that the ultimate explanation of all things was to be found in Newtonian mechanics was an adumbration of the truth that all science, as it grows towards perfection, becomes mathematical in its ideas.

Nobody has a right to speak more clearly than he thinks.

Life is an offensive, directed against the repetitious mechanism of the Universe.

One main factor in the upward trend of animal life has been the power of wandering.

Not ignorance, but ignorance of ignorance, is the death of knowledge.