He pointed out people's flaws, saying 'there are claws in the melon, but none in the claw.'

I am studying for the Japanese Language Proficiency Test next year.

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 always follows the teaching of 'Never invite suspicions needlessly,' and avoids actions that may cause suspicion.