Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
For it is a pleasure to be able to measure how much of our task has been accomplished, and the knowledge of what remains to do stimulates us to fresh effort over the labour that still awaits us. For nothing need seem long, when it is definitely known how far it is to the end.