Knowing One’s Weaknesses is the Beginning of Positive Change

知彼知己，百戰不殆；不知彼而知己，一勝一負；不知彼，不知己，每戰必殆

It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle.

~ Art of War, Ch. 3, the last sentence, by Sun Tzu