Jesus Christ is the same yesterday, and today, and forever. (Hebrews 13:8)
When you read this passage, have you ever wondered how many yesterdays ago Christ appeared? Was he an angel? A new creation that appeared after Gabriel visited Mary? Would you be surprised to learn that Christ was a part of creation?
Many scholars have discussed the allusions to Christ in the Old Testament. In fact, Isaiah 53 has been called the fifth gospel. Both John and Christ speak of Christ existing prior to Abraham and at creation. Once you understand the difference in behavior between an angel and Christ, you can easily find instances of Christ's presence in the Old Testament. You will find a continuity between the testaments that you never realized existed. Academic Bible scholars may find my approach simple.
Those of us who are humbly seeking the Lord will find it simply amazing and simply reassuring that our Lord was, is, and will remain in control.