One must work, if not out of inclination, at least out of despair. All things considered, work is far less boring than entertaining oneself.
 
[Il faut travailler, sinon par goût, au moins par désespoir, puisque, tout bien vérifié, travailler est moins ennuyeux que s’amuser.]

Charles Baudelaire (1821-1867) French poet, essayist, art critic

Journaux Intimes [Intimate Journals], “Mon cœur mis à nu [My Heart Laid Bare],” § 40 (1864–1867; pub. 1887) [tr. Sieburth (2022)]
    (Source)

(Source (French)). Alternate translations:

One must work, if not from inclination at least from despair, since, as I have fully proved, to work is less wearisome than to amuse oneself.
[tr. Isherwood (1930)]

It is necessary to work, if not from inclination, at least from despair. As it turns out, work is less boring than amusing oneself.
[Source, e.g.]

One must work, if not from inclination, at least out of despair -- since it proves, on close examination, that work is less boring than amusing oneself.
[Source, e.g.]