People weighed down with troubles do not look back; they know only too well that misfortune stalks them.

You who suffer because you love, love still more. To die of love, is to live by it.

The guillotine is the ultimate expression of Law, and its name is vengeance; it is not neutral, nor does it allow us to remain neutral.

Where the telescope ends the microscope begins, and which has the wider vision?

Poetry contains philosophy as the soul contains reason.

Superstition, bigotry and prejudice, ghosts though they are, cling tenaciously to life; they are shades armed with tooth and claw. They must be grappled with unceasingly, for it is a fateful part of human destiny that it is condemned to wage perpetual war against ghosts. A shade is not easily taken by the throat and destroyed.

In the relations of man with the animals, with the flowers, with all the objects of creation, there is a whole great ethic, scarcely perceived as yet, which will at length break through into the light, and which will be the corollary and the complement to human ethics.