A fox may grow gray, but never good. 江山易改，本性难移。
6. A good conscience is a soft pillow. 不做亏心事，不怕鬼叫门。
7. A good medicine tastes bitter. 良药苦口。
8. A light heart lives long. 静以修身。
9. All rivers run into sea. 海纳百川。 10. All roads lead to Rome. 条条大路通罗马。