The world has no end, and what is good among one people is an abomination with others. - Chinua Achebe

A proud heart can survive general failure because such a failure does not prick its pride. It is more difficult and more bitter when a man fails alone.

And theories are no more than fictions which help us to make sense of experience and which are subject to disconfirmation when their explanations are no longer adequate.

That we may accept a limitation on our actions but never, under no circumstances, must we accept restriction on our thinking.