κοινὸν τύχη, γνώμη δὲ τῶν κεκτημένων → good luck is anyone's, judgment belongs only to those who possess it
certātor: ōris, m. id.,
I a disputant (rare and post-class.), Gell. 12, 10, 3; App. Dogm. Plat. p. 2.
certātŏr, ōris, m. (certo), disputeur : Gell. 12, 10, 3 ; Apul. Plat. 1, 2.