Am I to be guided by this or by this? And how do I know that they will guide me to the same result?
We have a general kind of idea of how it goes on; but can't this after all be contradicted by the actual detailed calculation? Isn't there a danger of it going wrong after all?
     What is the truth which we see (& which is ‘obvious’)? That

This shows us that this was justified”.
      But then we leave behind us these justifications. At first imagination accompanies us a stretch & then we are left alone.