“That which you believe becomes your world.”
Source: What Dreams May Come
Help us to complete the source, original and additional information
Richard Matheson 58
American fiction writer 1926–2013Related quotes
“Whatever you believe with feeling becomes your reality.”

Its okay to tell a lie but believing in your own lies makes you the first victim, you become your own enemy which limits ability to think progressively towards success in life.
Quoted from his first book https://en.wikipedia.org/wiki/Success_and_Failure_Based_on_Reason_and_Reality, "Success and Failure Based on Reason and Reality" https://www.amazon.co.uk/SUCCESS-FAILURE-BASED-REASON-REALITY/dp/9970983903/ on Amazon, P.124 (July 2018)

“Create the highest, grandest vision possible for your life, because you become what you believe”

State of Fear (2004)
Context: I think that you cannot eliminate religion from the psyche of mankind. If you suppress it in one form, it merely emerges in another form. Even if you don't believe in God, you still have to believe in something that gives meaning to your life, and shapes your sense of the world. Such a belief is religious.

"I Choose You"
Written by Bareilles, Jason Blynn, and Pete Harper
Lyrics, The Blessed Unrest (2013)

“If you are going to impose your will on the world, you must have control over what you believe.”
Source: The Name of the Wind

Source: Who Is Man? (1965), Ch. 5<!-- The sense of the ineffable, p. 89 -->
Context: Faith is not belief, an assent to a proposition, faith is attachment to the meaning beyond the mystery.
Knowledge is fostered by curiosity; wisdom is fostered by awe. Awe precedes faith; it is the root of faith. We must be guided by awe to be worthy of faith.
Forfeit your sense of awe, let your conceit diminish your ability to revere, and the world becomes a market place for you. The loss of awe is the avoidance of insight. A return to reverence is the first prerequisite for a revival of wisdom, for the discovery of the world as an allusion to God.