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δῆλον

Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη -> The first and best victory is to conquer self.
Plato, Laws 626e

Russian (Dvoretsky)

δῆλον: adv. (тж. δ. δέ) ясно, очевидно, действительно Soph., Thuc., Arst., Theocr.