Again, a new commandment I write to you, which thing is true in Him and in you, because the darkness is passing away, and the true light is already shining. He who says he is in the light, and hates his brother, is in darkness until now.
1 John 2:8–9
The new commandment tests man as nothing else could. It reveals the latent evil hidden in every heart. Christ’s standard and ideals are too high for men of this world, who have their portion in this life. Only he who has received eternal life, through faith in the Lord Jesus (John 5:24) will be able to exemplify the love here instilled. He who gave the command to love one another proved His own love for mankind by dying for our sins. When He dwells in the heart by faith, His love is reproduced in others. It is not something that has to be pumped up as from an almost dry well. It is an ever-rising, overflowing stream coming from the renewed hearts of those who have been born of God and whose very nature it is to love as He loved us (1 John 4:7).
Love of God, so pure and changeless;
Blood of Christ, so rich and free;
Grace of God, so strong and boundless,—
Magnify it all to me,
H. A. Ironside, The Continual Burnt Offering: Daily Meditations on the Word of God (Neptune, NJ: Loizeaux Brothers, 1994), 357.