He must learn to control his temper.

他得学会捺住性子。

《牛津词典》

He must learn from other goats.

要它学习其他羊。

youdao

He must learn to tread carefully.

他得学着要小心行事。

youdao

He must learn to reject unwise or imprudent requests from friends and associates without losing their friendship or loyalty.

NPR: A Public Man Must Live in the Present

Once Edwards does re-emerge in the public spotlight, he must learn to ignore his critics and simply focus on doing good works.

FORBES: How Can Former Senator John Edwards Rehabilitate His Tarnished Image?

Through me, he must learn to see all people as created equal, to never disrespect women in any way with verbal, emotional or physical abuse.

CNN: As a father, 'I have to be the best human I can be'