Society lives by faith, and develops by science.

True humility is contentment.

Analysis kills spontaneity. The grain once ground into flour springs and germinates no more.

Let mystery have its place in you ; do not be always turning up your whole soil with the ploughshare of self-examination, but leave a little fallow corner in your heart ready for any seed the winds may bring.

Life alone can rekindle life.

It gives liberty and breadth to thought, to learn to judge our own epoch from the point of view of universal history, history from the point of view of geological periods, geology from the point of view of astronomy.

Joy is the vital air of the soul.