I found a reason.

“Be not afraid of life. Believe that life is worth living and your belief will help create the fact.”

-William James

from here.

“Your belief in God is merely an escape from your monotonous, stupid and cruel life.”

-Jiddu Krishnamurti

“No man is great enough or wise enough for any of us to surrender our destiny to. The only way in which anyone can lead us is to restore to us the belief in our own guidance.”

-Henry Miller

“Man is a credulous animal, and must believe something; in the absence of good grounds for belief, he will be satisfied with bad ones.”

-Bertrand Russell

“I had therefore to remove knowledge, in order to make room for belief.”

-Immanuel Kant

“The mark of your ignorance is the depth of your belief in injustice and tragedy. What the caterpillar calls the end of the world, the Master calls the butterfly.”

-Richard Bach

from here.