All God had to say was already written. Anything He has to say will simply point to what He has written. There is no new revelation. This is what Gnosticism is all about.
No new public revelation, but without hearing voices, if you think God cannot sometimes "speak" thru your conscience, or "to your heart" such as in who to pray for or go to, or place to minister, or marry, etc., then you do not have a religion of the living God. As for prophecy, while i have never known of a true one in my life, the cae for cessationism fails, and I cannot put the Book of Acts in a museum, but must test all things by the only wholly God-inspired authoritative revelation of Scripture.
Exactly. The Bible is sufficient for all our needs.