And there comes to pass that inward discord
of which we have said so much and worrying torment 
of
the mind angry with itself; when it loathes its own defilements, yet cleanses
them not
away; sees the crooked paths yet does not forsake them; dreads the impending
danger yet stirs not a step to avoid it
(Francis Petrarch)
They
say it is misery itself to live in folly, to err, to be deceived, and to
be ignorant.
On the contrary: this is what it is to be human.
Desiderius Erasmus, The Praise of Folly, 1514