Wisdom is the reward you get for a lifetime of listening when you'd have preferred to talk.
The only wisdom we can hope to acquire is the wisdom of humility: humility is endless.
It is better to remain silent at the risk of being thought a fool, than to talk and remove all doubt of it.
It is unwise to be too sure of one's own wisdom. It is healthy to be reminded that the strongest might weaken and the wisest might err.