Deuteronomy 6:5 says,
And you shall love the Lord your God with all your [mind and] heart and with your entire being and with all your might. In the New Testament, Jesus repeats this command and even points it out as the most important commandment of all (as well as loving your neighbor as yourself).
So, how do you express love for God? By telling God, “I love You”? Singing praises to Him? These are good things, but they only scratch the surface.
We show God we love Him through obedience because actions definitely speak louder than words. I believe our level of obedience grows as we get to know and experience His love, goodness and faithfulness in our lives. Our desire to follow and obey the Lord’s commandments increases as we increase our love of God.