Smoke on the Mountain: An Interpretation of the Ten Commandment
“We are constantly railing against the passions; we ascribe to them all of man’s afflictions, and we forget that they are also the source of all his pleasures”
As translated in Diderot (1977) by Otis Fellows, p. 39
Variant translations:
One declaims endlessly against the passions; one imputes all of man's suffering to them. One forgets that they are also the source of all his pleasures.
Only passions, great passions, can elevate the soul to great things.
Pensées Philosophiques (1746)
Source: Pensées philosophiques
Context: We are constantly railing against the passions; we ascribe to them all of man’s afflictions, and we forget that they are also the source of all his pleasures … But what provokes me is that only their adverse side is considered … and yet only passions, and great passions, can raise the soul to great things. Without them there is no sublimity, either in morals or in creativity. Art returns to infancy, and virtue becomes small-minded.
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Denis Diderot 106
French Enlightenment philosopher and encyclopædist 1713–1784Related quotes

“To what shall the character of utility be ascribed, if not to that which is a source of pleasure?”
Théorie des peines et des récompenses (1811); translation by Richard Smith, The Rationale of Reward, J. & H. L. Hunt, London, 1825, Bk. 3, Ch. 1

Source: Guide for the Perplexed (c. 1190), Part III, Ch.17
Context: Another fundamental principle taught by the Law of Moses is this: Wrong cannot be ascribed to God in any way whatever; all evils and afflictions as well as all kinds of happiness of man, whether they concern one individual or a community, are distributed according to justice; they are the result of strict judgement that admits no wrong whatever.

“The pleasure of love is in loving; we are happier in the passion we feel than in what we inspire.”
Le plaisir de l'amour est d'aimer; et l'on est plus heureux par la passion que l'on a que par celle que l'on donne.
Maxim 259. Compare: "They who inspire it most are fortunate, As I am now; but those who feel it most Are happier still", Percy Bysshe Shelley, Prometheus Unbound, Act ii, Scene 5.
Reflections; or Sentences and Moral Maxims (1665–1678)