He must not be someone who has only recently come to faith, so that he will not become puffed up with pride and fall under the same condemnation that befell the devil.
He must not be a recent convert, or he may become conceited and fall under the same judgment as the devil.
OJBHe must not be a neophyte in the emunah [of Moshiach], lest, having become a ba'al gaavah (a haughty person), he might fall into the din HaSatan (the judgment or verdict of the Adversary, the Accuser).
TCENTHe must not be a new convert, or he might become puffed up and fall into the condemnation of the devil.
T4THe must not be one who has just recently trusted in Jesus, because if you choose a man like that, he might become conceited/proud because you chose him so soon. As a result of his being conceited/proud, God will condemn him like he condemned the devil because he was conceited/proud.