1 Corinthians 6:14
Blame not the body then; let not the Devil take away your honor, which God has given you. For if we choose, the body is an excellent bridle to curb the wanton sallies of the soul, to pull down haughtiness, to repress arrogance, to minister to us in the greatest achievements of virtue. For tell me not of those who have lost their senses; since we often see horses, after they have thrown out their drivers, dashing with their reins over the precipices, and yet we do not blame the rein. For it is not the breaking of that which caused it all, but the driver not holding them in was the ruin of every thing. Just so do thou reason in this case. If you see a young person living in orphanhood and doing innumerable evil things, blame not the body, but the charioteer who is dragged on, I mean, the man's faculty of reasoning. For as the reins give no trouble to the charioteer, but the charioteer is the cruise of all the mischief through his not holding them properly: (and therefore do they often exact a penalty of him, entangling themselves with him, and dragging him on, and compelling him to partake in their own mishap:) so is it also in the case before us. “I,” say the reins, “made bloody the horse's mouth as long as you held me: but since you threw me away, I require satisfaction for your contempt, and I entwine myself about you, and drag you along, so as not to incur the same usage again.” Let no one then blame the reins, but himself and his own corrupt mind. For over us too is a charioteer, even reason: and the reins are the body, connecting the horses with the charioteer; if then these be in good condition, you will suffer no harm: but if you let them go, you have annihilated and ruined every thing. Let us be temperate then, and lay all blame not on the body, but on the evil mind. For this is the Devil's special work, to make foolish men accuse the body and God and their neighbor, rather than their own perverted minds; lest, having discovered the cause, they get free from the root of the evils.
But do ye, being aware of his design, direct your wrath against him: and having set the charioteer upon the car, bend the eye of your minds towards God. For in all other instances he that appoints the games contributes nothing, but only awaits the end. But in this case, He is all in all, who appointed the contest, even God. Him therefore let us render propitious, and surely we shall obtain the blessings in store; through the grace and loving-kindness of our Lord Jesus Christ, to Whom, with the Father and the Holy Spirit, be glory, power, honor, now, henceforth, and for evermore. Amen.
Source: Homilies on First Corinthians (New Advent)