"Ambition often puts Men upon doing the meanest offices; so climbing is performed in the same position with creeping."

Next Quote

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 Burton