A worthy person can change quickly — a wise person admits mistakes and changes, while a fool never does (archaic proverb).
彼は前の方針を撤回し、新しい方法を採用した。まさに君子豹変すだ。
He withdrew the previous policy and adopted a new approach. Truly, a worthy person changes quickly.
『君子豹変す』という言い方はやや古いが、柔軟に考えを変えることを肯定する表現だ。
The phrase 'kunshi hyōhensu' is somewhat old-fashioned, but it affirms the virtue of changing one’s mind flexibly.