It’s through universal Misunderstanding that everybody comes to agreement.
If, by some misfortune, everybody understood each other, one could never come to agree.
 
[C’est par le malentendu universel que tout le monde s’accorde.
Car si, par malheur, on se comprenait, on ne pourrait jamais s’accorder.]

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

Journaux Intimes [Intimate Journals], “Mon cœur mis à nu [My Heart Laid Bare],” § 99 (1864–1867; pub. 1887) [tr. Sieburth (2022)]
    (Source)

(Source (French)). Alternate translations:

It is by universal misunderstanding that all agree.
For if, by ill luck, people understood each other, they would never agree.
[tr. Isherwood (1930)]

It is by universal misunderstanding that we agree with each other.
If, by some misfortune, we understood each other, we would never agree.
[Source]