1 Samuel 12:13-14
13 Sh’mu’el said to Sha’ul, “You did a foolish thing. You didn’t observe the mitzvah of Adonai, which he gave you. If you had, Adonai would have set up your kingship over Isra’el forever. 14 But as it is, your kingship will not be established. Adonai has sought for himself a man after his own heart, and Adonai has appointed him to be prince over his people, because you did not observe what Adonai ordered you to do.”
How many times have I done this, worshiping Adonai in “my own way” instead of honoring how He wants to be worshiped. God can’t truely be the Lord of your life if you continue to do what you want and not what He asks you to do.