“Doubt grows with knowledge.”
“We know accurately only when we know little; doubt grows with knowledge.”
“A person that started in to carry a cat home by the tail was getting knowledge that was always going to be useful to him, and warn't ever going to grow dim or doubtful.”
“Wonder rather than doubt is the root of all knowledge.”
“It is beyond a doubt that all our knowledge begins with experience.”
“Doubt … is an illness that comes from knowledge and leads to madness.”