“One very important thing that young lawyers must know is that when one argues a case and later in the evening you ponder over it and say, that’s what I should have said (but you never said it), that’s the only regret. It could have been the winning point or something you wish you had not said, which is even worse. If you get angry at that point in the courtroom, losing your temper can be a disaster. You can’t afford it because your client suffers and nobody likes you for it. It all comes with age and practice.”
Conversation with the living legend of law - Fali Sam Nariman
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Fali Sam Nariman 24
Indian politician 1929Related quotes
Source: The Repossession Mambo (2009), Chapter 21 (p. 311)

Review http://www.rogerebert.com/reviews/the-sitter-2011 of The Sitter (7 December 2011)
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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

Variant: It’s important in life to conclude things properly. Only then can you let go. Otherwise you are left with words you should have said but never did, and your heart is heavy with remorse.
Source: Life of Pi