Ivan Sergeyevich Turgenev. (№ 12533)

Argue with a person smarter than you: he'll win, but because of your injury you can benefit for yourself.
Argue with a man of the mind is: for whoever has the victory - at least you will experience the fun of struggle.
Argue with the weakest human mind: the dispute is not the desire to win, but you can be useful to him.
Argue even with a fool: no glory, no gain you will not extract, but why sometimes not fun?