Albert Barnes' Notes on the Whole Bible - Romans 12:15
Rejoice with them ... - This command grows out of the doctrine stated in Romans 12:4-5, that the church is one; that it has one interest; and therefore that there should be common sympathy in its joys and sorrows. Or, enter into the welfare of your fellow-Christians, and show your attachment to them by rejoicing that they are made happy; compare 1 Corinthians 12:26, “And whether .... one member be honored, all the members rejoice with it.” In this way happiness diffuses and multiplies itself.... read more
The Pulpit Commentary - Romans 12:18-21
If it be possible, as much as lieth in you, live peaceably with all men. Avenge not yourselves, beloved, but give place unto wrath . The thought in Romans 12:19 seems to follow from what precedes. It may sometimes be impossible to he at peace with all; but at any rate, do not increase bitterness by avenging yourselves. Give place unto wrath ( τῇ ὀργῇ ) , has been taken by some to mean that we are to give scope to the wrath of our enemy, instead of being exasperated to resist... read more