Once you were not a people, but now you are the people of God; once you had not received mercy, but now you have received mercy.
Sometimes remembering where you were will help you to appreciate where you are. In the case of a Christian, where you were is extremely different that where you are. Possibly the most extreme difference possible. You WERE without mercy. Now you have received the mercies of God. There is not much that could be more extreme than that.
Once again, these thoughts should result in praise. Praise Him through your work today. Praise Him in how you speak to your spouse and your children. Praise Him in how you drive and in how you walk and talk.