There Is Only One Good Knowledge And One Evil

"The only good is knowledge and the only evil is ignorance."

"Real knowledge is to know the extent of one's ignorance."

"The only source of knowledge is experience."

"Life is neither good nor bad, but only a place for good and bad."

"The only true wisdom is in knowing you know nothing."

"“Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science.”"