No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. You cannot serve God and mammon.
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Glossa Ordinaria
AD 1480
Non occ.: Otherwise; it had been declared above, that good things become evil, when done with a worldly purpose. It might therefore have been said by someone, I will do good works from worldly and heavenly motives at once. Against this the Lord says, “No man can serve two masters.”.
ord.: By “mammon” is meant the Devil, who is the lord of money, not that he can bestow them unless where God wills, but because by means of them he deceives men.