The word 'hatarakikotoba' is used in this old document.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

The phrase 'the good and bad deed cancel out' perfectly describes his past actions.

He always keeps in mind the saying, 'those who do not work should not eat.'

He keeps the words 'Don't hesitate to correct your mistakes when you make them' in his heart, always striving for self-improvement.