For by grace are ye saved through faith, and that not of yourselves. It is the gift of God. God is the sole source of every righteous word and deed. True repentance, for example, is impossible until man is convicted of sin by God. If He does not call, man cannot respond.
Praise is a response.
Worship is a response. That is grace. The action starts with God's love and will, not with man's need and desire. No prayer that springs from the will of man finds any place in heaven. There is no such thing as an unanswered prayer, when God initiates the praying.