Gospel in the Old Testament

So I guess I wasn't well informed but in Old Testament class we have been studying the prophets. I guess I hav never realized how much Law and Gospel were part of the Old Testament. Now that i look back at it I remember learning. There are many times we do stuff that goes against what God wants for our lives, but God just keeps on loving me and everyone around me. It's amazing how much I learn about the Bible each time I go class! SOLI DEO GLORIA!!!