Difficulty is a coin which the learned conjure with so as not to reveal the vanity of their studies and which human stupidity is keen to accept in payment

The world is all a carcass and vanity, The shadow of a shadow, a play And in one word, just nothing.

They conceive mischief, and bring forth vanity, and their belly prepareth deceit.

Did I know myself less, I might perhaps venture to handle something or other to the bottom, and to be deceived in my own inability; but sprinkling here one word and there another, patterns cut from several
pieces and scattered without design and without engaging myself too far, I am not responsible for them, or obliged to keep close to my subject, without varying at my own liberty and pleasure, and giving up myself to doubt and uncertainty, and to my
own governing method, ignorance.

His mouth is full of cursing and deceit and fraud: under his tongue is mischief and vanity.

Satiety comes of too frequent repetition; and he who will not give himself leisure to be thirsty can never find the true pleasure of drinking