10 All this by faith, so long as we are absent from the Lord, dwelling in the body; but when we shall have traversed the way, and have reached the home itself, what shall be more joyful than we? What shall be more blessed than we? Because nothing more at peace than we; for there will be no rebelling against a man. But now, brethren, it is difficult for us to be without strife. We have indeed been called to concord, we are commanded to have peace among ourselves; to this we must give our endeavor, and strain with all our might, that we may come at last to the most perfect peace; but at present we are at strife, very often with those whose good we are seeking.
There is one who goes astray, you wish to lead him to the way; he resists, you strive with him: the pagan resists you, you dispute against the errors of idols and devils; a heretic resists, you dispute against other doctrines of devils; a bad catholic is not willing to live aright, you rebuke even your brother within; he dwells with you in the house, and seeks the paths of ruin; you are inflamed with eager passion to put him right, that you may render to the Lord a good account of both concerning him.
How many necessities of strife there are on every side! Very often one is overcome with weariness, and says to himself, What have I to do with bearing with gainsayers, bearing with those who render evil for good? I wish to benefit them, they are willing to perish; I wear out my life in strife; I have no peace; besides, I make enemies of those whom I ought to have as friends, if they regarded the good will of him that seeks their good: what business is it of mine to endure this?
Let me return to myself, I will be kept to myself, I will call upon my God. Do return to yourself, you find strife there. If you have begun to follow God, you find strife there. What strife, do you say, do I find? “The flesh lusts against the Spirit, and the Spirit against the flesh.” Behold you are yourself, you are alone, you are with yourself; behold, you are bearing with no other person, but yet you see another law in your members warring against the law of your mind, and taking you captive in the law of sin, which is in your members.
Cry aloud, then, and cry to God, that He may give you peace from the inner strife: “O wretched man that I am, who shall deliver me from the body of this death? The grace of God through our Lord Jesus Christ.” Because, “He that follows me,” says He, “shall not walk in darkness, but shall have the light of life.” All strife ended, immortality shall follow; for “the last enemy, death, shall be destroyed.” And what peace will this be? “This corruptible must put on incorruption, and this mortal must put on immortality.” To which that we may come (for it will then be in reality), let us now follow in hope Him who said, “I am the light of the world: he that follows me shall not walk in darkness, but shall have the light of life.”
Source: Tractates on the Gospel of John (New Advent)