I saw also your thread about
Justice or law as a measure.
I am not quite sure what you mean by “measure,” or “measure of all things,” but I think the answer is that love, law, and justice are all directed toward good, and therefore toward God.
The Old Law (Old Testament, Mosaic Law) was directed toward the good, but tended to emphasize the negative consequences of disobedience, sin, and evil. At the personal level, this meant dishonor, shame, punishment, banishment, or death. At the societal level, this meant military defeat, captivity, or exile.
The Old Law was not always negative. One counterexample which readily comes to mind is the commandment to “Honor your father and your mother, that you may have a long life in the land the Lord your God is giving you.”
The New Law (New Testament, Gospel) tends to emphasize love, forgiving others (even though this sometimes goes against our ideas of “justice”), God’s forgiveness (“Your sins are forgiven”), our repentance (“Go and sin no more”), peace (“Go in peace” and “Peace be with you”), and faith.
Of course the New Testament is not all lovey-dovey. There are more than a few passages about the fires of hell.
Is love the measure of all things? I don’t think so.
Are love, law, and justice measures of good? Yes.
Is love the measure of all that is good? Maybe. Let’s discuss!