1 Jon 4:7, “Beloved, let us love one another, because love comes from God. Everyone who loves has been born of God and knows God.” John writes this based on a promise Moses records in Deuteronomy 30:6, “And the LORD thy God will circumcise thine heart, and the heart of thy seed, to love the LORD thy God with all thine heart, and with all thy soul, that thou mayest live.” We often confuse the word circumcise but it simply means to cut away a portion to make something clean. In the Deuteronomy passage Moses is saying that the unclean part of our heart will be cut away to make it clean. These verses indicate that would be very difficult to truly know how to love each other or even ourself until we eliminate any unholy spirit that would interfere with that love.