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.

He was appointed as the chief of staff of the army.

He is good at playing the character of a soldier.

He belongs to the Self-Defense Forces.

He was an ancient soldier.

She is planning a date with her current boyfriend.

He lost everything.

My boyfriend gave me a gift.

Everyone was surprised by the news.

He knows that pain through his own experience.