"Teacher, which commandment in the law is the greatest?" He said to him, "You shall love the Lord, your God, with all your heart, with all your soul, and with all your mind. This is the greatest and the first commandment. The second is like it: You shall love your neighbor as yourself. The whole law and the prophets depend on these two commandments." Matthew 22:36-40
I love this one, because it tells us the truth. To love God first and foremost, with all of our being. This is the greatest and best commandment of all.
Loving God is a very beautiful experience, it is one everyone should experience too. We all know what it is like to fall in love with others and the feelings it brings us. There are so many ways of explaining love, yet no two are the same for anyone to feel. Such is the same with God. But when we love God as if he is the greatest treasure we have ever found, then we love all the more those around us. When people cause hurt, we love them and seek to heal their woundedness. God does this with us too, he teaches us the value of love.
He sent his Son to teach us a very important lesson, one of unconditional love for His Father. To do His will above his own. Jesus showed us his love, by dying for us. God showed us his love by giving His Son back to us by Resurrecting him.