Love Is an Active Principle
God's giving of His Son to save the world is the model for the active practice of love (John 3:16). God did not show His love for us by waiting for us to come crawling to Him. This would have been the passive principle of love.
Instead, God took the initiative and actively seeks to demonstrate His love to us. This is the active principle of love. Throughout the Bible, we see God taking the initiative and showing His love for mankind. His greatest example was to send His Son to show us how to live on earth and to die for our sins so we might live with Him in eternity (John 14:15; Galatians 2:19-20; Colossians 3:17; Hebrews 13:1-2).
Love Fulfills the Law
Romans 13:10 says, "Love does no wrong to a neighbor; love therefore is the fulfillment of the law." The "law" Paul is talking about is the second greatest commandment - "You shall love your neighbor as yourself" (Matthew 22:36-40). So when we love others, we are obeying God's law (Mark 12:23; Luke 10:28; 1 Corinthians 13:1-8).
In our fallen world, love is not a natural virtue. It is something that we must learn. As Paul told Timothy - "...the goal of our instruction is love, from a pure heart and a good conscience and a sincere faith" (1 Timothy 1:5). True love comes from God and we reflect it to others.
Love Is the Fruit of the Spirit
We can either perform the deeds of the flesh (Galatians 5:16-21) or allow the fruit of the Spirit to grow within us (Galatians 5:22-23). It is our choice. We decide whether we will serve God or Satan (Matthew 7:16-20; Romans 5:3-5; 6:21-22; 8:9; 1 Corinthians 13:4-8; Ephesians 5:8-11; Colossians 3:12-14).