The moment a little boy is concerned with which is a jay and which is a sparrow, he can no longer see the birds or hear them sing. Eric Berne
To be happy we must not be too concerned with others. Albert Camus
I am not here concerned with intent, but with scientific standards, especially the ability to tell the difference between a fact, an opinion, a hypothesis, and a hole in the ground. Serge Lang
Every autobiography is concerned with two characters, a Don Quixote, the Ego, and a Sancho Panza, the Self. W. H. Auden
It is a bit embarrassing to have been concerned with the human problem all one's life and find at the end that one has no more to offer by way of advice than 'try to be a little kinder.' Aldous Huxley
Excellence, then, is a state concerned with choice, lying in a mean, relative to us, this being determined by reason and in the way in which the man of practical wisdom would determine it. Aristotle