Don't make light of reading the Old Testament. St. Paul did not! John Wesley did not!
Excerpt from John Wesley's sermon on "The Means of Grace" Sermon 12:
8. And that this is a means whereby God not only gives, but also confirms and increases, true wisdom, we learn from the words of St. Paul to Timothy: “From a child thou hast known the holy Scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus.” (2 Tim. 3:15.) The same truth (namely, that this is the great means God has ordained for conveying his manifold grace to man) is delivered, in the fullest manner that can be conceived, in the words which immediately follow: “All Scripture is given by inspiration of God;” consequently, all Scripture is infallibly true; “and is profitable for doctrine, for reproof, for correction, for instruction in righteousness;” to the end “that the man of God may be perfect, thoroughly furnished unto all good works.” (2 Tim. 3:16, 17.)