недавно нашел в инете.
"I believe what I said yesterday. I don't know what I said, but I know what I think, and, well, I assume it's what I said."
"Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns -- the ones we don't know we don't know."
Это цитаты разговора Дональда Рамсфельда с журналистами.
Особенно понравилась вторая цитата.
"...Есть знания, которые мы знаем.
Есть вещи, о которых мы знаем то, что мы их знаем.
Мы также знаем, что есть вещи, про которые мы знаем,
что мы о них ничего не знаем".