1 John 4:7 says, Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God. John then calls on us to love one another if we are followers of Christ. This is not just a good feeling we have about other people, but a willingness to lay down our life for them, even if they don't like or even hate us. This is the love that Jesus Christ displayed on the cross. He loved sinners enough to die for them, and this includes you and me. John said that people who truly love other people with this type of love are born of God. When we accept Jesus Christ as our Savior and Lord, then we are born of God.
Verse eight adds, He that loveth not knoweth not God; for God is love. John then said the opposite is true. If we don't have this type of love for others, then we are not of God. We cannot profess to be a Chrisitan and at the same time display hatred toward anyone.
Verse nine continues, In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him. John said that we could know God's love is manifested toward us because He sent His only begotten Son, Jesus Christ, to die for our sins so that we might live spiritually through Him. If we are born again Christians, which is the only way to be a Chrisitan, then we should live under the guidance of the Holy Spirit.
Verse ten states, Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins. John said that love is not known by the fact that we love God, but that He loved us enough to send His only begotten Son to die for our sins. Love comes down from God to us by faith in the Son.
Verse eleven adds, Beloved, if God so loved us, we ought also to love one another. John then says that if God loved us this much, then if we have accepted His gift of salvation, then we should love everyone the same way. Yet, too often we don't even love our fellow believers.