Allah (swt) says:
Whomever is hostile to a friend of Mine I declare war against. My slave approaches Me with nothing more beloved to Me than what I have made obligatory upon him, and My slave keeps drawing nearer to Me with voluntary works until I love him. And when I love him, I am his hearing with which he hears, his sight with which he sees, his hand with which he seizes, and his foot with which he walks. If he asks Me, I will surely give to him, and if he seeks refuge in Me, I will surely protect him. I do not hesitate from anything I shall do more than My hesitation to take the soul of the believer who dislikes death; for I dislike displeasing him” [Bukhari]
Islam, Submission, is the inward and the outward. It is obligatory and voluntary acts done solely for the pleasure and sake of Allah (swt). The means is annihilation of your own self, until you reach the goal of a state where you are a friend of Allah (swt).