Marcus Aurelius book Meditations
To seek what is impossible is madness: and it is impossible that the bad should not do something of this kind.
Τὸ τὰ ἀδύνατα διώκειν μανικόν· ἀδύνατον δὲ τὸ τοὺς φαύλους μὴ τοιαῦτά τινα ποιεῖν.
V, 17
Meditations (c. 121–180 AD), Book V