In Romans 12:9-21, St Paul lists a variety of attitudes, feelings and behaviors which he believes are genuinely Christian, and thus to be put into practice by all who follow Christ. The list is simple and straightforward, so no commentary is needed. We only need to put them into practice in our hearts, minds and lives to demonstrate our own desire to be disciples of our Lord God and Savior Jesus Christ.
Let love be genuine;
hate what is evil, hold fast to what is good;
love one another with brotherly affection;
outdo one another in showing honor.
Never flag in zeal, be aglow with the Spirit, serve the Lord.
Rejoice in your hope, be patient in tribulation, be constant in prayer.
Contribute to the needs of the saints, practice hospitality.
Bless those who persecute you; bless and do not curse them.
Rejoice with those who rejoice, weep with those who weep.
Live in harmony with one another;
do not be haughty, but associate with the lowly; never be conceited.
Repay no one evil for evil, but take thought for what is noble in the sight of all.
If possible, so far as it depends upon you, live peaceably with all.
Beloved, never avenge yourselves, but leave it to the wrath of God; for it is written, “Vengeance is mine, I will repay, says the Lord.”
No, “if your enemy is hungry, feed him; if he is thirsty, give him drink; for by so doing you will heap burning coals upon his head.”
Do not be overcome by evil, but overcome evil with good.