"There is only one passion, the passion for happiness. " — Denis Diderot

All our discontents about what we want appeared to me to spring from the want of thankfulness for what we have.

Source: The Life and Adventures of Robinson Crusoe

Happiness in marriage is entirely a matter of chance

Source: Pride and Prejudice (1813)

Blessedness is not the reward of virtue, but virtue itself.

Source: Ethics, part 5, proposition 42 (1677)

Variety's the very spice of life, That gives it all its flavor.

Source: The Task (1785)

My heart leaps up when I behold A Rainbow in the sky:

Source: Poems in Two Volumes, My Heart Leaps Up (1807)

I celebrate myself, and sing myself,

Source: Leaves of Grass, Song of Myself (1892 edition)

Denis Diderot Quote