While we are reasoning concerning life, life is gone.

The whole [of religion] is a riddle, an ænigma, an inexplicable mystery. Doubt, uncertainty, suspence of judgment appear the onlyresult of our most accurate scrutiny, concerning this subject.

Look round this universe. What an immense profusion of beings, animated and organized, sensible and active! You admire this prodigious variety and fecundity. But inspect a little more narrowly these living existences, the only beings worth regarding. How hostile and destructive to each other! How insufficient all of them for their own happiness! How contemptible or odious to the spectator! The whole presents nothing but the idea of a blind Nature, inpregnated by a great vivifying principle, and pouring forth from her lap, without discernment or parental care, her maimed and abortive children.

The heights of popularity and patriotism are still the beaten road to power and tyranny; flattery to treachery; standing armies to arbitrary government; and the glory of God to the temporal interest of the clergy.

..when, in my philosophical disquisitions, I deny a providence and a future state, I undermine not the foundations of society, but advance principles, which they themselves, upon their own topics, if they argue consistently, must allow to be solid and satisfactory.

Uncommon expressions are a disfigurement rather than an embellishment of discourse.

Nothing endears so much a friend as sorrow for his death. The pleasure of his company has not so powerful an influence.