Why the scorpion needs to stab the lion?

  

The scorpion promises the lion not to stab him, if the lion agrees to carry the scorpion cross the river.

The scorpion couldn't stop himself when they were in the middle of the river.

The scorpion stabs the lion.

Both of them will die.  

But  no one knows why.

The two giants promise each other to work together to make big money.

One of them will commit suicide to kill both of them.

No one knows why.

There is one Chinese word to explain this situation.

It is 勢(shi)

One of them will take action to kill against his own will.

People believes that they do have a will.

But they do not.

They are only acting according to the 勢(shi)

Please do not trust yourself.

Please study history.