“If you gaze at a single leaf on a single tree, you do not see the other leaves. If you face the tree with no intention and do not fix your eyes on a single leaf, then you will see all the many leaves. If your mind is preoccupied with one leaf, you do not see the others, if you do not set your attention on one; you will see hundreds and thousands of leaves.”
A Hereditary Book on the Art of War (1632)
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Yagyū Munenori 10
samurai and daimyo of the early Edo period 1571–1646Related quotes

Variant translations
If you know others and know yourself, you will not be imperiled in a hundred battles; if you do not know others but know yourself, you win one and lose one; if you do not know others and do not know yourself, you will be imperiled in every single battle.
Know your enemy and know yourself, find naught in fear for 100 battles. Know yourself but not your enemy, find level of loss and victory. Know not thy enemy nor yourself, wallow in defeat every time.
Literal translation: Know [the] other, know [the] self, hundred battles without danger; not knowing [the] other but know [the] self, one win one loss; not knowing [the] other, not knowing [the] self, every battle must [be] lost.
Source: The Art of War, Chapter III · Strategic Attack
“I would have offered you a forest of truth, but you wish to speak of a single leaf”
Source: Fall of Kings

(14th May 1825) Song
The London Literary Gazette, 1825

“Sometimes what you want is right in front of you. All you have to do is open your eyes and see it.”
Source: All-American Girl

“You see with your mind what others miss with their eyes.”
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