Crossword puzzle clue "the wise man knows himself to fool shak"

"The wise man knows himself to __ fool": Shak.

Who wrote "He who knows others is wise; he who knows himself is enlightened"

"Man will do many things to get himself loved, he will do all things to get himself ___": Mark Twain

"The fool ___ think he is wise": Shak.

"Bid the dishonest man __ himself": Shak.

"___ should keep himself to himself": "Treasure Island"

Buddy who everybody knows is gay but himself?

"And how ___ the wise man? as the fool": Ecclesiastes 2:16