Owe no one anything except to love one another, for he who loves another has fulfilled the law. For the commandments, “You shall not commit adultery,” “You shall not murder,” “You shall not steal,” “You shall not bear false witness,” “You shall not covet,” and if there is any other commandment, are all summed up in this saying, namely, “You shall love your neighbor as yourself.” Love does no harm to a neighbor; therefore love is the fulfillment of the law. (Romans 13:8-10)
“Our neighbors are, for us, a school in which we are given practice in the most perfect love – love for God. Every loving act that we perform for another fuels our love for God, and the ground of our love for our neighbor is clearly shown in word and deed by the Lord Himself and His holy apostles, and by the hosts of those pleasing to God: our God-bearing fathers and the martyrs. The greatest works of love are acts of charity, the forgiving of insults, prayer for others, the support of the weak, the subduing of the proud, prayer for others, the support of the weak, the subduing of the proud, the reproving of the unrighteous, the teaching of the unlearned, the concealing of others’ weaknesses, the praising of others’ virtues, the defense of the oppressed, and the laying down of one’s life for others: ‘Greater love hath no man than this: that a man lay down his life for his friends‘ (John 15:13).
But if a man makes the greatest sacrifice from any other motive than that of love, his sacrifice is worthless (1 Corinthians 13:3). He who has love has all, and has fulfilled all the Law.” (St Nikolai Velimirovic, HOMILIES Vol 2, p 156)