Grace may be free, but it isn’t cheap. This is the classic first question from the Heidelberg Catechism, Question 1. Let it stir you to worship!
Leader: What is your only hope in life and in death?
All: That I belong – body and soul, in life and in death – not to myself but to my faithful Savior, Jesus Christ, who at the cost of his own blood has fully paid for all my sins and has completely freed me from the dominion of the devil; that he protects me so well that without the will of my Father in heaven not a hair can fall from my head; indeed that everything must fit his purpose for my salvation. Therefore, by his Holy Spirit, he also assures me of eternal life, and makes me wholeheartedly willing and ready from now on to live for him.