Yet however grim circumstances are, human beings, if they really are human, occasionally relax.

[Homines quamvis in turbidis rebus sint, tamen, si modo homines sunt, interdum animis rexantur.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher
Philippics [Philippicae; Antonian Orations], No. 2, ch. 16 / sec. 39 (2.16/2.39) (44-10-24 BC) [tr. Grant (1960)]
    (Source)

To Antony's accusations of his inappropriately telling jokes while in camp with Pompey's army.

(Source (Latin)). Other translations:

Men, so long as they are men, relax at times even amid the heaviest perplexities.
[tr. King (1877)]

Men, in whatever anxiety they may be, if they are men, sometimes indulge in relaxation.
[ed. Hoyt (1896)]

But men, in however troublous times -- if only they are human -- sometimes relax their minds.
[tr. Ker (Loeb) (1926)]

Although men are in great difficulties, still, provided they are men, they sometimes relax their minds.
[tr. Yonge (1903)]

In whatever trouble men may be, yet so long as they are men, they must occasionally have their moments of cheerfulness.
[ed. Harbottle (1906)]

Human beings, even in times of crisis, do sometimes unwind, if they are human at all.
[tr. Berry (2006)]

Even when they are in troubled situations, men, if they are human, still relax their minds from time to time.
[tr. McElduff (2011)]