How do we know that the commandment to love God is true?

In Matthew 22:37-40, Jesus explicitly defines the command to love God as the greatest of all commandments. He instructs that we should love the Lord with all our heart, soul, and mind, underscoring that this foundational commandment encompasses all other laws. By loving God in this way, believers fulfill the law in its entirety, reflecting God's righteousness in their lives. This commandment is affirmed through both the teachings of Jesus and the apostles, establishing the truth of this call to love deeply and wholly the God who first loved us.