We as Children of God understand that the opposite of love is sin, in the spiritual world. That those of us given to sin hate God, and know not God. To walk in the light, and fellowship with Him, we have to practice the love of God that is shed abroad in our hearts and learn to love even our enemies. That feelings is down the list behind doing the Will of God and truth plays a much larger role. Love is keeping God's commandments, and sin, then, is the breaking of His commandments, which are for those that hate God.