Because a fact seems strange to you, you conclude that it is not one. ... All science, however, commences by being strange. Science is successive. It goes from one wonder to another. It mounts by a ladder. The science of to-day would seem extravagant to the science of a former time. Ptolemy would believe Newton mad.

The book which the reader now holds in his hands, from one end to the other, as a whole and in its details, whatever gaps, exceptions, or weaknesses it may contain, treats of the advance from evil to good, from injustice to justice, from falsity to truth, from darkness to daylight, from blind appetite to conscience, from decay to life, from bestiality to duty, from Hell to Heaven, from limbo to God. Matter itself is the starting-point, and the point of arrival is the soul. Hydra at the beginning, an angel at the end.

It is the essence of truth that it is never excessive.... We must not resort to the flame where only light is required.

Vengeance comes from the individual and punishment from God.

They adored each other; but still the permanent and the immutable subsist. We may love and laugh, pout, clasp hands, smile, and exchange endearments, but that does not affect eternity. Two lovers hide in the dusk of evening, amid flowers and the twittering of birds, and enchant each other with their hearts shinning in their eyes; but the stars in their course still circle through infinite space.

Intelligence is the wife, imagination is the mistress, memory is the servant.

Often the losing of a battle leads to the winning of progress. Less glory but greater liberty: the drum is silent and the voices of reason can be heard.