If someone doesn't know their Old Testament, they don't know right doctrine, right correction, and they can't be equipped for good works.

The early Church had nothing but the Old Testament. The New Testament lies hidden in the Old; the Old Testament lies open in the New.

In the Old Testament, we are continually told that our good works are not enough, that God has made a provision. This provision is pointed to at every place in the Old Testament.

The God of the Old Testament is the depiction of evil.

Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.

Prosperity is the blessing of the Old Testament; adversity is the blessing of the New.