Re: To fully understand the New Testament you need to have the Old Testament in your
I would say "to fully understand the OT, you need the NT" , in which only means that NT sheds more light on the OT, not that the OT doesn't explain some things in the NT. For example, the NT explains some of the prophecies and symbols God uses to point to Christ. The Law and the prophets point to and are embodied in Christ Himself, they were the substitute for Christ and many in the OT didn't see this until Christ had come and gone. However, some of the symbols in the NT, especially Revelations, can find their meaning in the OT.