A similarly narrow purpose (Saunders)

This world-making via thinking is natural, sane, Darwinian:  we do it to survive.  Is there harm in it?  Well, yes, because we think in the same way that we hear or see:  within a narrow, survival-enhancing range.  We don't see or hear all that might be seen or heard but only that which is helpful for us to see and hear.  Our thoughts are similarly restricted and have a similarly narrow purpose:  to help the thinker thrive.

George Saunders, A Swim in a Pond in the Rain