NET
18 The person who speaks on his own authority desires to receive honor for himself; the one who desires the honor of the one who sent him is a man of integrity, and there is no unrighteousness in him.
Darby
18 He that speaks from himself seeks his own glory; but he that seeks the glory of him that has sent him, he is true, and unrighteousness is not in him.
KJV
18 “He that speaketh of himself seeketh his own glory: but he that seeketh his glory that sent him, the same is true, and no unrighteousness is in him.”