the great dispute................

 If we sometimes spent a little consideration on ourselves, and employed in probing ourselves the time we put into checking up on others and learning about things that are outside us, we would easily sense how much this fabric of ours is built up of feeble and failing pieces.  Is it not a singular evidence of our imperfection that we cannot establish our contentment in any one thing, and that even in desire and imagination it is beyond our power to choose what we need?  A good proof of this is the great dispute that has always gone on between the philosophers over the sovereign good of man, and that still goes on and will go on eternally, without solution and without agreement:

-Michel de Montaigne, The Complete Works, Book 1, Chapter 53