John Wesley on 1 John 2:8

Again, I do write a new commandment to you - Namely, with regard to loving one another. A commandment which, though it also was given long ago, yet is truly new in him and in you. It was exemplified in him, and is now fulfilled by you, in such a manner as it never was before. For there is no comparison between the state of the Old Testament believers, and that which ye now enjoy: the darkness of that dispensation is passed away; and Christ the true light now shineth in your hearts.