In honor of Reformation Week, here is a great quotation from Martin Luther’s Large Catechism:
The First Commandment: “You shall have no other gods.” That is, you shall regard me alone as your God. What does this mean, and how is it to be understood? What is it to have a god? What is God?
Answer: A god is that to which we look for all good and in which we find refuge in every time of need. To have a god is nothing else than to trust and believe him with our whole heart. As I have often said, the truth and faith of the heart alone make both God and an idol. If your faith and trust are right, then your God is the true God. On the other hand, if your trust is false and wrong, then you have not the true God. For these two belong together, faith and God. That to which your heart clings and entrusts itself is, I say, really your God.