In reality, love is a choice & an action. God is the source of our love: he loved is enough to sacrifice his son for us. Jesus is our example of what it means to love; everything he did in life & death was supremely loving. The Holy Spirit gives us power to love; he lives in our hearts & makes more & more like Jesus. God's love always involves a choice & an action, & our love should be like his.
The world thinks love is what make you feel good, & it is willing to sacrifice moral principles & others' rights in order to obtain such "love." Our definition of love must come from God who is holy, just, & perfect. At the same time, if we truly know God, we must learn to love as he does.
"Only begotten" means God's unique Son.
Love explains (1) why God creates; (2) why God cares; (3) whey we are free to choose; (4) why Christ died; & (5) why we receive eternal life.
Nothing sinful or evil can exist in God's presence. He cannot overlook, condone, or excuse sin as if it never happened. We can be acquitted (Romans 5:18) by his atoning sacrifice ("propitiation").
Jesus is the complete expression of God in human form & he has revealed God to us. When we love one another, the invisible God reveals himself to others through us, & his love is made complete ("perfect").
John isn't telling us how many people to love, but how much to love the people we already know. Our job is to faithfully love the people God has given us to love, whether there are two or two hundred of them. If God sees we are ready to love others, he will bring them to us. God provides us the strength to do what he asks.
When we become Christians, we receive the Holy Spirit. God's presence in our lives is a proof that we really belong to him & gives us the power to love. If you lack assurance of your salvation, listen to the Holy Spirit within you (Romans 8:16).
The day of judgment is that final day when we will appear before Christ & be held accountable for our actions. We can look forward to the judgment, because it will mean the end of sin & the beginning of a face-to-face relationship with Jesus Christ.
If we ever begin to dear eternity, heaven, or God's judgment, we can remind ourselves of God's love. We can be confident of what lies ahead if in this life we have determined to be more like Jesus.
God's love is the source of all human love, & it spreads like fire. In turn, they love others, who are warmed by God's love through them.
Reference summary used from Life Application Bible KJV, Tyndale House Publishers, Inc., Wheaton, Illinois