What is the second part of the most unpleasant suggestion?

Advice that is most needed is least valued.

"Good medicine tastes bitter and is good for illness, but advice when most unpleasant is good for action", which means "good medicine tastes bitter and is good for illness; Most of the languages that teach people to be good are not very nice, but they are conducive to people correcting their own shortcomings. "

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"Good medicine tastes bitter and is good for illness, but advice that is hard to hear is good for action" comes from Confucius' Family Instructions, aiming at educating people to accept criticism bravely. Now it is often used to explain that we should treat other people's opinions and criticisms correctly.

It is not terrible for a person to make a mistake, as long as he can correct it in time, he will be fine. The terrible thing is that he is afraid of getting sick and unwilling to accept criticism from others, thus making mistakes from small to big, and from big to hopeless.