Matthew 22:39

Thou shalt love thy neighbor - The love of our neighbor springs from the love of God as its source; is found in the love of God as its principle, pattern, and end; and the love of God is found in the love of our neighbor, as its effect, representation, and infallible mark. This love of our neighbor is a love of equity, charity, succor, and benevolence. We owe to our neighbor what we have a right to expect from him - "Do unto all men as ye would they should do unto you," is a positive command of our blessed Savior. By this rule, therefore, we should speak, think, and write, concerning every soul of man: - put the best construction upon all the words and actions of our neighbor that they can possibly bear. By this rule we are taught to bear with, love, and forgive him; to rejoice in his felicity, mourn in his adversity, desire and delight in his prosperity, and promote it to the utmost of our power: instruct his ignorance, help him in his weakness, and risk even our life for his sake, and for the public good. In a word, we must do every thing in our power, through all the possible varieties of circumstances, for our neighbors, which we would wish them to do for us, were our situations reversed.

This is the religion of Jesus! How happy would Society be, were these two plain, rational precepts properly observed! Love Me, and love thy Fellows! Be unutterably happy in me, and be in perfect peace, unanimity, and love, among yourselves. Great fountain and dispenser of love! fill thy creation with this sacred principle, for his sake who died for the salvation of mankind!

On the nature of self-love, see Matthew 19:19 .