John Calvin, quoted in Credenda Agenda, Volume 5 Number 2, p. 2, from Calvin's Commentaries, Vol. XX, Baker, 1979, p. 158.
But what does he (Paul) wish them to learn? That no one be puffed up for his own teacher against another, that is, that they be not lifted up with pride on account of their teachers, and do not abuse their names for the purpose of forming parties, and rending the Church asunder. Observe, too, that pride or haughtiness is the cause and commencement of all contentions, when every one, assuming to himself more than he is entitled to do, is eager to have other in subjection to him.