Leviticus 19:37 Therefore shall ye observe all my statutes, and all my judgments, and do them: I am the Lord.
Yahweh is Yahweh, the Lord is the Lord, God is God. Because I am Yahweh, you will observe and do what I say. I am the Lord who brought you up; I am the Lord who delivered you; I am the Lord who saves you; I am the Lord who blesses you. I act according to my character, which is pure love. My love for you acts on your behalf for your good.
The more you get to know Me, My Love and My Work the greater will be your desire and ability to respond by doing what I say. The more we come to know Jesus the Lord the more we will and do of His good pleasure. The Holy Spirit changes our desires and gives us the ability to observe and do His statutes and judgments. The Lord changes our lives from the inside out; human effort or force will not succeed.
Ye shall is both a command and a promise. Obedience will be our response to the overwhelming love and amazing grace of God. We always have need of, and never tire of, the Gospel, for it is the power of God. Our response to thr Lord is living a better life.