Such is his inherent cussedness that we would rather let him warp in the oven of his own half-baked knowledge.

Life is too short to waste our time in educating him.
"How can I see Mr.So-and-so ?" says one man to another.
"Don't try," is the answer.

"He's not worth seeing.

You can't tell _him_ anything." And this sort of a chap misses the big opportunities just because he chooses to build up a reputation for being exclusive.

He digs himself a hole and crawls into it _and pulls the hole in after him_.