Premanand Maharaj Ji
What does complete surrender to God really mean?
Giving body, mind and life to God
Complete surrender happens when you think no sinful thought, worship only God, and keep the firm feeling 'I am in God's shelter'. Handing body, mind and life over to God ends the ego of 'mine'.
When your own existence is no longer in view, it is like giving this house in someone's name: then the thought 'this is my house' will no longer come to mind.