LITTLENESS VS. MAGNITUDE is a key section in the TEXT of A COURSE IN MIRACLES. The clarity of this Section gets us out of the limiting beliefs we have about ourselves, into a place of the Glory God created us to be.
Our "personal lies" are not true, therefore not real. The Unlimited Being we are would have the Magnitude placed there by our Creator, the Christ Consciousness.
It's a big Leap, but the purpose of A Course in Miracles is to help us make this Leap. Our Magnitude of Heaven is our release from the littleness we made up to be our hell.