Are there truths outside the Bible? Yes. Are some of them important truths passed on by wise men who knew the Lord or his Apostles? Yes. Are there truths outside the Bible necessary for salvation. No. Who Jesus is, what he did, what he accomplished on the cross, that he was resurrected and rose from the dead and ascended into heaven are pretty much laid out in black and white. As a result, our sins are forgiven and we are new men in Chirst. That is the gospel. The rest is backstory. Magnificent backstory. But backstory nevertheless.
Is there much more depth in the Bible that I don’t understand? Yes. Would I like to? Yes. Do I need to? No.
The important stuff is really really simple AND unambiguous.
Fascinating. So the Bible is the ultimate authority but you don't need to understand it fully? Did it ever occur to you that the Church has studied It for nearly 2000 years and has discovered many of the answers you admit you don't have?
Well said!