Three things you need: The ability to not give up something till it works， the ability to give up something that does not work， and the trust in other people to help you distinguish between the two.

自然界的普遍法则大多不是直接感知的对象。

To know good and evil is not enough； one must also do them.

仲弓问仁。孔子说：“出门时要象会见贵宾一样庄重，建工程时要象举行盛大祭典一样严肃。自己不愿做的，不要强加于人。同事中相处融洽，亲属中和睦友爱。”仲弓说：“我虽不才，愿照此办理。”