1. He gave his one and only son (16)

John 3:16, the key verse of the whole Bible tells about God, as love. He loved us first. He loved the world full of unlovely sinners who rebelled and betrayed God. He showed that love is giving, sacrificing his best, even his one and only Son as a sacrifice even on the cross. His desire is that no one may perish but have eternal life by just believing in his love. How wonderful is God's unconditional love!

2. Not to condemn but to save (17-21)

God sent Jesus not to condemn but to save the world. We all were already condemned because of our sins. But whoever believes in him shall not be condemned. Those unbelievers will remain condemned. This is the verdict: The light has come but they loved darkness hating the light because their deeds were evil. They were afraid of being exposed of their deeds. They don't want to repent. But those who love the truth come to the light to be shown as children of the light.