Progress, far from consisting in change, depends on retentiveness. Those who cannot remember the past are condemned to repeat it.

The idea of Christ is much older than Christianity.

Spirit itself is not human; it may spring up in any life... it may exist in all animals, and who know in how many undreamt-of beings, or in the midst of what worlds?

The human mind is not rich enough to drive many horses abreast and wants one general scheme, under which it strives to bring everything.

I believe in general in a dualism between facts and the ideas of those facts in human heads.

The body is an instrument, the mind its function, the witness and reward of its operation.

Wisdom comes from disillusionment.