Men’s ideas are like card-playing or any other game. Ideas which in the past I’ve seen considered reckless have since become commonplace, almost trivial, and adopted by men unworthy of sharing them. Ideas which now seem extraordinary will be regarded feeble and perfectly ordinary by our descendants.
 
[Les idées des hommes sont comme les cartes et autres jeux. Des idées que j’ai vu autrefois regarder comme dangereuses et trop hardies, sont depuis devenues communes, et presque triviales, et ont descendu jusqu’à des hommes peu dignes d’elles. Quelques-unes de celles à qui nous donnons le nom d’audacieuses seront vues comme faibles et communes par nos descendans.]

Nicolas Chamfort (1741-1794) French writer, epigrammist (b. Nicolas-Sébastien Roch)

Products of Perfected Civilization [Produits de la Civilisation Perfectionée], Part 1 “Maxims and Thoughts [Maximes et Pensées],” ch. 2, ¶ 145 (1795) [tr. Parmée (2003), ¶ 115]
    (Source)

(Source (French)). Alternate translations:

Men’s ideas are like cards and other games. Ideas which I remember to have seen regarded as dangerous and over-bold have since become commonplace and almost trite, and have descended to men little worthy of them. So it is that some of the ideas which to-day we call audacious will be considered feeble and conventional by our descendants.
[tr. Hutchinson (1902), "The Cynic's Breviary"]

Man's ideas are like card & other games. Ideas which I once heard stigmatised as dangerous and over-daring have since become common and even trivial, and have sunk to be the tenets of quite unworthy persons. Some ideas which we call audacious nowadays will seem feeble and ordinary to our descendants.
[tr. Mathers (1926)]

The ideas of men are like cards and other games. ideas that at one time, to my own knowledge, were considered dangerous and rash, have since become general, almost commonplace, and have descended to men who are little worthy of them. Some of those that we call daring will seem feeble and ordinary to our descendants.
[tr. Merwin (1969)]

The ideas of men are like cards and other games. Some ideas, which formerly I observed to be considered dangerous and intemperate, have since become universal, even trivial, and have been adopted by men scarcely worthy of them. Some notions which we call bold will be regarded as feeble and commonplace by our descendants.
[tr. Pearson (1973)]