“If you can't explain it simply, you don't understand it well enough.”

“i can't understand her"
well son, you might as well try to understand the sun”

“Don't criticize what you can't understand.”

“It is easy to understand God as long as you don't try to explain him.”

“Science is what we understand well enough to explain to a computer. Art is everything else we do.”

“I can't relate to lazy people. We don't speak the same language. I don't understand you. I don't want to understand you.”

“… you don't realize whether or not you completely understand a topic until you are tasked to explain it to someone else. … That really challenges your understanding of a topic.”

“In general, I feel if you can't say it clearly you don't understand it yourself.”

“The critic asks me: 'So you are a Symbolist? I mean well and I would like to learn; why don't you explain Symbolism to me'.. I answer...'Well, my paintings probably speak Hebrew, which you do not understand, so there is no point in continuing the conversation.”

“I can't understand these chaps who go round American universities explaining how they write poems: It's like going round explaining how you sleep with your wife.”