They [i.e. ambitious men] may not cease, but as a dog in a wheel, a bird in a cage, or a squirrel in a chain, so Budaeus compares them; they climb and climb still, with much labour, but never make an end, never at the top.
Robert BurtonLet thy fortune be what it will, 'tis thy mind alone that makes thee poor or rich, miserable or happy.
Robert Burton