prove all things

I recently questioned a popular teaching that I couldn't find in the Bible

It was suggested that it was a "deeper thing of God"

To me, the basics are as follows:

- Prove all things; hold fast that which is good. (1 Thess 5:21)
- So then faith cometh by hearing, and hearing by the word of God. (Rom 10:17)
- for whatsoever is not of faith is sin (Rom 14:23b)

Seems to me that if it a "deeper thing" does not pass the test of the basic things, then it is probably not some-thing we need to be messing with.