ἐξ οὗ πάλιν εὔλογον ὑπογίνεσθαί τινα θεωρίαν παρὰ τοῖς πολλοῖς αἰσχροῦ καὶ καλοῦ καὶ τῆς τούτων πρὸς ἄλληλα διαφορᾶς, καὶ τὸ μὲν ζήλου καὶ μιμήσεως τυγχάνειν διὰ τὸ συμφέρον, τὸ δὲ φυγῆς.
From this, once more, it is reasonable to suppose that there would arise in the minds of the multitude a theory of the disgraceful and the honourable, and of the difference between them; and that one should be sought and imitated for its advantages, the other shunned.
I don't understand how τυγχάνειν is functioning in this sentence, nor the three genitives that it seems to govern.
Can anybody point me to a definition in LSJ?
http://www.perseus.tufts.edu/hopper/mor ... =2#lexicon
Thanks in advance.