Reality is merely an illusion, although a very persistent one

May the dreams of your past be the reality of your future

As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.

Reality is merely an illusion, albeit a very persistent one.

All our science, measured against reality, is primitive and childlike-and yet it is the most precious thing we have.

To the extent math refers to reality, we are not certain; to the extent we are certain, math does not refer to reality.