New City CatechismSýnishorn

Question: What does the law of God require?

Answer: Personal, perfect, and perpetual obedience; that we love God with all our heart, soul, mind, and strength; and love our neighbor as ourselves. What God forbids should never be done and what God commands should always be done.

Commentary: Loving the Lord God with all your heart, mind, soul, and strength is the first great branch of Christian righteousness. You shall delight yourself in the Lord your God; seeking and finding all happiness in Him. You shall hear and fulfill His word, "My son, give me your heart." And having given Him your inmost soul to reign there without a rival, you may well cry out in the fulness of your heart, "I will love You, O my Lord, my strength. The Lord IS my strong rock; my Savior, my God, in whom l trust.''

The second commandment, the second great branch of Christian righteousness, is closely and inseparably connected with the first: "Love your neighbor as yourself." Love—embrace with the most tender goodwill, the most earnest and cordial affection, the most inflamed desires of preventing or removing all evil and bringing every possible good. Your neighbor—not only your friends, kinfolk, or acquaintances; not only the virtuous ones who regard you, who extend or return your kindness, but every person, not excluding those you have never seen or know by name; not excluding those you know to be evil and unthankful, those who despitefully use you.

Even those you shall love as yourself with the same invariable thirst after their happiness. Use the same unwearied care to screen them from whatever might grieve or hurt either their soul or body. This is love.