天可度，地可量，唯有人心不可防。

The sky is measurable, and the earth is measurable. Only the people who do dirty tricks are hard to measure.

但見丹誠赤如血，誰知偽言巧似簧。

We can sense a true heart as red as blood. But the more we can sense the false words of eloquence,

勸君掩鼻君莫掩，使君夫婦為參商。

Be aware of how people ask you to cover up your nose, lest you be separated from the people you love.

勸君掇蜂君莫掇，使君父子成豺狼。

Be aware when a woman asks you to dispel hornets on her body; otherwise, people may mistake you, even your father.

海底魚兮天上鳥，高可射兮深可釣。

You can angle up the fish from the bottom of the sea; you can shoot down the birds from the high sky.

唯有人心相對時，咫尺之間不能料。

But only when two hearts are close can neither one figure out the thoughts of the other.

君不見李義府之輩笑欣欣，笑中有刀潛殺人。

Dont you see people like Li Yifu who always have a smile on their face, but the smile is really a knife ready to kill with?

陰陽神變皆可測，不測人間笑是瞋.

We can predict the change of all things, even the unknown, but we cannot  tell a smiling face from an angry face.