12:15 Rejoice - The direct opposite to weeping is laughter; but this does not so well suit a Christian.

Romans 12:15 Parallel Commentaries

Sunday Before Lent
Text: First Corinthians 13. 1 If I speak with the tongues of men and of angels, but have not love, I am become sounding brass, or a clanging cymbal. 2 And if I have the gift of prophecy, and know all mysteries and all knowledge; and if I have all faith, so as to remove mountains, but have not love, I am nothing. 3 And if I bestow all my goods to feed the poor, and if I give my body to be burned, but have not love, it profiteth me nothing. 4 Love suffereth long, and is kind; love envieth not; love …
Martin Luther—Epistle Sermons, Vol. II

November the Twenty-Eighth How to Fight Evil
"Overcome evil with good." --ROMANS xii. 9-21. For how else can we cast out evil? Satan cannot cast out Satan. No one can clean a room with a filthy duster. The surgeon cannot cut out the disease if his instruments are defiled. While he removed one ill-growth he would sow the seed of another. It must be health which fights disease. It will demand a good temper to overcome the bad temper in my brother. And therefore I must cultivate a virtue if I would eradicate a vice. That applies to the state …
John Henry Jowett—My Daily Meditation for the Circling Year

The Sacrifice of the Body
'I beseech you, therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.'--ROMANS xii. 1. In the former part of this letter the Apostle has been building up a massive fabric of doctrine, which has stood the waste of centuries, and the assaults of enemies, and has been the home of devout souls. He now passes to speak of practice, and he binds the two halves of his letter indissolubly together by that significant …
Alexander Maclaren—Romans, Corinthians (To II Corinthians, Chap. V)