David fulfilled God purpose in his life by doing all God’s will. They go hand in hand, when you fulfill God’s will you will fulfill your own calling and destiny. This may sound like an obvious statement, however many Christians miss this obvious thing. They seek after career choices never even giving consideration to what God has for them. If God has called you to be an accountant then you will never be happy teaching and if you are called to teach you will never be happy as an accountant. God has placed something in each one of us to fulfill not only generally but specifically as well. No one else can tell you what your purpose is but if you will spend quiet time in God’s presence and listen to his voice you will know and God’s peace will be there to confirm the direction He has given you.