As the phrase 'If it does not sing, let's wait until the cuckoo sings' suggests, we should wait patiently until the opportunity comes.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

He is truly a person who embodies the saying, 'A man of virtue will naturally attract admirers.'

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.