But avoid foolish questions, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain.
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Ambrose of Milan
AD 397
Blessed is that servant [Paul] who can say: “I have fed you with milk and not with meat; for until now you were not able to bear it.” … Yet he—being so great a man and chosen by Christ for the care of his flock in order to strengthen the weak and to heal the sick—rejects immediately after a single admonition a heretic from the fold entrusted to him. This he does for fear that the taint of one erring sheep might infect the whole flock with a spreading sore. He further bids that foolish questions and contentions be avoided. Of the Christian Faith , Prologue –.
“Contentions,” he means, with heretics. He would not have us labor to no purpose, where nothing is to be gained, for they end in nothing. For when a man is perverted and predetermined not to change his mind, whatever may happen, why should you labor in vain, sowing upon a rock, when you should spend your honorable toil upon your own people, in discoursing with them upon almsgiving and every other virtue?.