Humility is to make a right estimate of one's self
Topic
Self-knowledge in this collection is consistently described as difficult, partial, and necessary. Twain's man-acknowledging-himself-a-liar is the most truthful entry: honesty about dishonesty is among the rarest forms of self-knowledge available. Goethe appears twice, and both entries resist resolution: I do not know myself and God forbid that I should — the second clause is the important one, turning ignorance from failure into protection. Talent-develops-in-tranquility is here because character formation requires the current of actual life rather than the still water of self-examination. The fortune-doesn't-change-a-man-only-unmasks-him proverb makes self-knowledge dependent on external pressure: you discover what you are when circumstances remove the ability to choose otherwise. Wilde's awakening-to-fame is the social mirror: who you are is sometimes revealed to you by how others respond before you have understood it yourself. Byron's transition-from-boyhood entry is the autobiographical founding: the moment of self-consciousness is the moment self-knowledge becomes necessary, and also the moment it becomes difficult.
Humility is to make a right estimate of one's self