Celestial wisdom calms the mind.

Men become friends by a community of pleasures.

Such are the vicissitudes of the world, through all its parts, that day and night, labor and rest, hurry and retirement, endear each other; such are the changes that keep the mind in action: we desire, we pursue, we obtain, we are satiated; we desire something else and begin a new pursuit.

In a man's letters you know, Madam, his soul lies naked, his letters are only the mirror of his breast, whatever passes within him is shown undisguised in its natural process. Nothing is inverted, nothing distorted, you see systems in their elements, you discover actions in their motives.

Courtesy and good-humour are often found with little real worth.

What is read twice is usually remembered more than what is once written.

In youth, it is common to measure right and wrong by the opinion of the world, and in age, to act without any measure but interest, and to lose shame without substituting virtue.