The great affairs of life are not performed by physical strength, or activity, or nimbleness of body, but by deliberation, character, expression of opinion.
 Marcus Tullius Cicero, On Friendship (44 BC). copy citation

add
Author Marcus Tullius Cicero
Source On Friendship
Topic strength expression
Date 44 BC
Language English
Reference
Note Translated by E. S. Shuckburgh
Weblink http://www.gutenberg.org/files/2808/2808-h/2808-h.htm

Context

“They are like men who would say that a steersman does nothing in sailing a ship, because, while some of the crew are climbing the masts, others hurrying up and down the gangways, others pumping out the bilge water, he sits quietly in the stern holding the tiller. He does not do what young men do; nevertheless he does what is much more important and better. The great affairs of life are not performed by physical strength, or activity, or nimbleness of body, but by deliberation, character, expression of opinion. Of these old age is not only not deprived, but, as a rule, has them in a greater degree. Unless by any chance I, who as a soldier in the ranks, as military tribune, as legate, and as consul have been employed in various kinds of war, now appear to you to be idle because not actively engaged in war.” source