Life is complex in its expression, involving more than percipience, namely desire, emotion, will, and feeling.

Philosophy begins in wonder. And, at the end, when philosophic thought has done its best, the wonder remains.

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.

You may not divide the seamless coat of learning.

The guiding motto in the life of every natural philosopher should be, seek simplicity and distrust it.

Every intellectual revolution which has ever stirred humanity into greatness has been a passionate protest against inert ideas. Then, alas, with pathetic ignorance of human psychology, it has proceeded by some educational scheme to bind humanity afresh with inert ideas of its own fashioning.

The motive of success is not enough.