In Colossians 2.18-23 Paul speaks of false teachers who delight in false humility. They go into great detail about what they have seen, and their unspiritual mind puffs them up with idle notions. Quite the contrast to what is said about Moses in Numbers 12.1-9, When a prophet of the Lord is among you, I reveal myself to him in visions, I speak to him in dreams. Prophets who dream dreams and see visions, certainly would have something to boast about in the flesh. But, note what the Lord says about Moses, Moses is faithful in all my house. With him I speak face to face, clearly and not in riddles; he sees the form of the Lord.
Moses had more reason to boast than any of the false teachers. Yet, in verse 3 we read, Moses was a very humble man, more humble than anyone else on the face of the earth. Self-righteousness is a terrible fruit of pride and the last person to know it exists is the one who demonstrates it. Some things that we see and experience are best to ponder and be left untold lest we become pharisaical and unknowingly bear the fruit of pride.