делающий счастливым

From LSJ

ἀρετὰ γὰρ ἐπαινεομένα δένδρον ὣς ἀέξεται → for virtue that is praised grows like a tree, praised virtue will grow like a tree

Source

Russian > Greek

εὐδαιμονικός, ὀλβιοεργός, εὔανδρος