History of the Peloponnesian War

"To you I write, who know how small a time any fleet continueth in the height of vigour, and how few of the mariners are skilful both how to hasten the course of a galley and how to contain the oar.

But of all, my greatest trouble is this: that being general, I can neither make them do better (for your natures are hard to be governed) nor get mariners in any other place (which the enemy can do from many places), and must of necessity have them from whence we brought both those we have and those we have lost. For our now confederate cities, Naxos and Catana, are not able to supply us.