Keep displaying your ignorance.
John 21:25
Douay-Rheims Christian Community
25 But there are also many other things which Jesus did; which, if they were written every one, the world itself, I think, would not be able to contain the books that should be written. But Jesus did many other things; if all were written down, the world itself would not hold the books recording them.
Keep displaying your own invincibility in the same? well that, and much else...
[yes I realize that's getting personal --- but you started it, so no whining]
As was pointed out, there is no mention of things he (Christ) said not being "written down".
The notables from amongst the early church defeated various gnosticisms, by use of scripture, using what had been written down, not by substitution of some vague allusions to esoteric knowledge that they themselves had had transmitted to them...that is, until within Tradition™ itself, by dribs and drabs, and subtle shifts of definitions & applications, that very thing can be seen to have developed.