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 suddenly started acting as if he had gone mad.

You, what are you doing?

That person is my friend.

It is important for each person to fulfill their role.

He lost everything.

She is planning a date with her current boyfriend.

My boyfriend gave me a gift.

Everyone was surprised by the news.

It's better for him not to know the truth. After all, ignorance is bliss.