"It is not enough to have a good mind the main thing is to use it well.

I am indeed amazed when I consider how weak my mind is and how prone to error.
I am indeed amazed when I consider how weak my mind is and how prone to error.
I am indeed amazed when I consider how weak my mind is and how prone to error.
I am indeed amazed when I consider how weak my mind is and how prone to error.