Related:

• Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.
  -- Bertrand Russell (1872-1967)...
• Mathematics is the only science where one never knows what one is talking about nor whether what is said is true.
  -- Russell...
• No matter what we are talking about, we are talking about ourselves. -- Prathe
• Just what chicken and which road are we talking about?
• Now, what were we talking about?
• A nation which does not remember what it was yesterday, does not know what it is today, nor what it is trying to do.
  We are trying to do a futile thing if we do not know where we came from or what we have been about....
• We know what we are, but know not what we may be. -- William Shakespeare, Hamle
• Well we know where we're going, but we don't know where we've been, and we know what we're knowing, but we can't say what we've seen .
  .. we're on the road to nowhere. -- Talking Head...
• In the part of this universe that we know there is great injustice, and often the good suffer, and often the wicked prosper, and one hardly knows which of those is the more annoying.
  -- Bertrand Russell...