St. Augustine wrote “Love God and do as you please” because as you grow in love for God what pleases Him will become what pleases you. A portion of the last chapter from Kevin DeYoung's Just Do Something:
The will of God isn’t a special direction here or a bit of secret knowledge there. God doesn’t put us in a maze, turn out the lights, and tell us, “Get out and good luck.” In one sense, we trust in the will of God as His sovereign plan for our future. In another sense, we obey the will of God as His good word for our lives. In no sense should we be scrambling around trying to turn to the right page in our personal choose-your-own-adventure novel.The Whole Duty of Man – Kevin DeYoung
God’s will for your life and my life is simpler, harder, and easier than that. Simpler, because there are no secrets we must discover. Harder, because denying ourselves, living for others, and obeying God is more difficult than taking a new job and moving to Fargo. Easier, because as Augustine said, God commands what He wills and grants what He commands.
In other words, God gives His children the will to walk in His ways–not by revealing a series of next steps cloaked in shadows, but by giving us a heart to delight in His law.
So the end of the matter is this: Live for God. Obey the Scriptures. Think of others before yourself. Be holy. Love Jesus. And as you do these things, do whatever else you like, with whomever you like, wherever you like, and you’ll be walking in the will of God.