Exhortations to earnestness and moderation
I Exhort you in God, that you add [speed] to your course, and that you vindicate your dignity. Have a care to preserve concord with the saints. Bear [the burdens of] the weak, that “you may fulfil the law of Christ.” Devote yourself to fasting and prayer, but not beyond measure, lest you destroy yourself thereby. Do not altogether abstain from wine and flesh, for these things are not to be viewed with abhorrence, since [the Scripture] says, “You shall eat the good things of the earth.” And again, “You shall eat flesh even as herbs.” And again, “Wine makes glad the heart of man, and oil exhilarates, and bread strengthens him.” But all are to be used with moderation, as being the gifts of God.
“For who shall eat or who shall drink without Him? For if anything be beautiful, it is His; and if anything be good, it is His.” Give attention to reading, that you may not only yourself know the laws, but may also explain them to others, as the earnest servant of God. “No man that wars entangles himself with the affairs of this life, that he may please him who has chosen him to be a soldier; and if a man also strive for masteries, yet is he not crowned except he strive lawfully.” I that am in bonds pray that my soul may be in place of yours.
Source: The Spurious Epistles (New Advent)