The chains that bind us the most closely are the ones we have broken.
Innumerable spirits and souls, when spread out through the same space, do not interfere with each other such that the diffusion of one would affect the diffusion of an infinity of others.
With man, the life of the body depends on the life of the spirit.
The only joy in the world is to begin.
It is fortunate, I think, that nature is not bounded by human reason and by laboratory work and experimentation, for by the laws of pure reason and by microscopic investigation, it might easily have been proved, long before this, that children could not be born.