A learned fool is more a fool than an ignorant fool.

I assure you that a learned fool is more foolish than an ignorant fool

The learned man knows that he is ignorant.

I have learned more from my mistakes than from my successes.

The learned fool writes nonsense in better language that the unlearned - but it's still nonsense.

I've learned any fool can write a bad ad, but it takes a real genius to keep his hands off a good one.