Timing:When you're wrong, or did something wrong.
Accept the fact that no one does everything flawlessly. To err is human, they say. Mistakes are perfectly normal. It’s up to you to make the most out of every experience, and choose to learn from it. Having an mature attitude about mistakes and learning will improve your self-confidence significantly.
Please refer to the book for more details on this activity.
According to me, one who accepts his own mistake is brave and courageous. Also, he is trustworthy. Accepting my mistake allows me to face myself when I look into the mirror - I am not fake.