The message of the Good News comes to a focus in this verse. God's love is not static or self-centered; it reaches out and draws others in. Here God sets the pattern of true love, the basis for all love relationship--when you love someone dearly, you are willing to give freely to the point of self-sacrifice. God paid dearly with the life of his Son, the highest price he could pay. Jesus accepted our punishment, paid the price for our sins, and then offered us the new life that he had bought for us. When we share the Good News with others, our love must be like Jesus'--willingly giving up our own comfort and security so that others might join us in receiving God's love.
Some people are repulsed by the idea of eternal life because their lives are miserable. But eternal life is not an extension of a person's miserable mortal life,eternal life is God's life embodied in Christ given to all believers now as a guarantee that they will live forever. In eternal life there is no death, sickness, enemy, evil, or sin. When we don't know Christ, we make choices as though this life is all we have. In reality, this life is just the introduction to eternity. Receive this new life by faith and begin to evaluate all that happens from an eternal perspective.
To "believe" is more than intellectual agreement that Jesus is God. It means to put our trust and confidence in him that he alone can save us. It is to put Christ in charge of our present plans and eternal destiny. Believing is both trusting his words as reliable, and relying on him for the power to change. If you have never trusted Christ, let this promise of everlasting life be yours --- "and believe."