Errors belong to libraries; truth, to the human mind.

The best pleasures of this world are not quite true.

Be always resolute with the present hour. Every moment is of infinite value.

When intelligent and sensible people despise knowledge in their old age, it is only because they have asked too much of it and of themselves.

The soul is indestructible and its activity will continue through eternity. It is like the sun, which, to our eyes, seems to set at night; but it has in reality only gone to diffuse its light elsewhere.

Self knowledge is best learned not by contemplation, but by action.

Man must strive, and striving he must err.