"Reality is what we take to be true. What we take to be true is what we believe. what we believe is based upon our perceptions. What we perceive depends on what we look for. What we look for depends on what we think. What we think depends on what we perceive. What we perceive determines what we believe. What we believe determines what we take to be true. What we take to be true is our reality."

-Bohm, 1977

"...without the making of theories I am convinced there would be no observation"

-Darwin, 1860 letter to Lyell

"It is only the nonbeliever who believes that the believer believes."

-Jean Pouillon

"To believe is to know you believe, and to know you believe is not to believe."

-Sartre