Why was Vision so weak in Infinity War?

Why was Vision so weak in Infinity War? So Visions weakness was his mind. His disbelief in himself was causing the power of the stone to be hindered enough to where he was able to be stabbed, and not phase. His head was cluttered with so much negativity, that it caused him to give up his existence and be willing to die.

So Visions weakness was his mind. His disbelief in himself was causing the power of the stone to be hindered enough to where he was able to be stabbed, and not phase. His head was cluttered with so much negativity, that it caused him to give up his existence and be willing to die.