The following are some quotes by Zhuge Liang:
"Nothing is harder to see into than people's nature.
The sage looks at subtle phenomena
and listens to small voices.
This harmonizes the outside with the inside
and the inside with the outside."
(from the Records of the Loyal Lord of Warriors)
"Detach from emotions and desires; get rid of any fixations."
"The loss of any army is always caused by underestimating the enemy. Therefore gather information and watch the enemy carefully."
"Good generals select intelligent officers, thoughtful advisors, and brave subordinates. They oversee their troops like a fierce tiger with wings."
"You are harmed by decadence when judgment is based on private views, when forces are mobilized for personal reasons. These generals are treacherous and immoral."
"To overcome the intelligent by folly is contrary to the natural order of things; to overcome the foolish by intelligence is in accord with the natural order . To overcome the intelligent by intelligence, however, is a matter of opportunity . There are three avenues of opportunity : events, trends, and conditions . When opportunities occur through events but you are unable to respond, you are not smart . When opportunities become active through a trend and yet you cannot make plans, you are not wise . When opportunities emerge through conditions but you cannot act on them, you are not bold . Those skilled in generalship always achieve their victories by taking advantage of opportunities .“ ( Zhuge Liang, circa 200 AD, The Way of the General )
"... an enlightened ruler does not worry about people not knowing him; he worries about not knowing people . He worries not about outsiders not knowing insiders, but about insiders not knowing outsiders . He worries not about subordinates not knowing superiors, but about superiors not knowing subordinates . He worries not about the lower classes not knowing the upper classes, but about the upper classes not knowing the lower classes .“ ( Zhuge Liang, circa 200 AD, The Way of the General )
"Opportunistic relationship can hardly be kept constant . The acquaintance of honorable people, even at a distance, does not add flowers in times of warmth and does not change its leaves in times of cold : it continues unfading through the four seasons, becoming increasingly stable as it passes through ease and danger."