An ignorant person is one who doesn't know what you have just found out.
“The taxpayers are sending congressmen on expensive trips abroad. It might be worth it except they keep coming back”
“Every man gets an opportunity once in a lifetime.”
“See what will happen if you don't stop biting your fingernails”
“A smattering of everything, and a knowledge of nothing.”
“I see, these books are probably law books, and it is an essential part of the justice dispensed here that you should be condemned not only in innocence but also in ignorance.”
“If ignorance were bliss, he'd be a blister”
“Science can never grapple with the irrational. That is why it has no future before it, in this world.”
“The trouble with most of us is that we know too much that ain't so.”
“Knowledge studies others, wisdom is self known.”