Doubt and certainty Quotes

Believe those who seek the truth, doubt those who find it; doubt all, but do not doubt yourself.

— Andre Gide

Fools and fanatics are always so certain of themselves.

— Bertrand Russell

both doubt and certainty are as contagious as the common cold

— Kathryn Schulz

The neurotic has problems; the psychotic has solutions.

— Thomas Szasz