"If you love me, obey my commandments."
What is love? The Beatles recorded the classic song on the subject, "All You Need Is Love," and then they broke up and sued each other. Various philosophers have expressed opinions on love as well. Plato said that love is a serious mental disease. Oliver Wendell Holmes, who was more optimistic on the subject, said, "Love is the master key which opens the gates of happiness." Another said, "Love is the only sane and satisfactory answer to the problem of human existence."
We are given probably the greatest definition of love in 1 Corinthians 13:
Love is patient and kind. Love is not jealous or boastful or proud or rude. It does not demand its own way. It is not irritable, and it keeps no record of being wronged. It does not rejoice about injustice but rejoices whenever the truth wins out. Love never gives up, never loses faith, is always hopeful, and endures through every circumstance.
The Bible clearly tells us that God is love. We don't have a greater example of love than what we have in God's showing His love for us. And we find the definitive statement on love in John 3:16: "For God loved the world so much that he gave his one and only Son, so that everyone who believes in him will not perish but have eternal life." So how should we respond? We ought to love Him back.
We can talk all day about love and how much we love God. We can sing about our love for God. We can speak about our love for God. But probably the best way to show our love for Him is by what we do. Jesus said, "If you love me, obey my commandments" (John 14:15).