Deuteronomy 6:3 KJV

[3]Hear therefore, O Israel, and observe to do it; that it may be well with thee, and that ye may increase mightily, as the Lord God of thy fathers hath promised thee, in the land that floweth with milk and honey

When you’re obedient it gives you power and opens the doors of blessings. If you read further, you see what happens when you’re not obedient. You have the cross and the grace of God to allow the Holy Spirit to give you wisdom and understanding. We have so much more now because of the cross. Being obedient is to follow Him and that will increase you in power and grace.