To doubt everything or to believe everything are two equally convenien — Skepticism

"Skepticism: excellent seasoning, pitiful entrée."

"If it were so, as conceited sagacity, proud of not being deceived, thinks, that we should believe nothing that we cannot see with our physical eyes, then we first and foremost ought to give up believing in love. ... We can be deceived by believing what is untrue, but we certainly are also deceived by not believing what is true. ... Which deception is more dangerous?"

"Even if my philosophy does not extend to discovering anything new, it does nevertheless possess the courage to regard as questionable what has long been thought true."

"Meno: How will you look for something when you dont in the least know what it is? How on earth are you going to set up something you dont know as the object of your search? ..."

"The doctrine of those who have denied that certainty could be attained at all, has some agreement with my way of proceeding at the first setting out; but they end in being infinitely separated and opposed. For the holders of that doctrine assert simply that nothing can be known; I also assert that not much can be known in nature by the way which is now in use. But then they go on to destroy the authority of the senses and understanding; whereas I proceed to devise helps for the same."

"We are on the road to producing a race of men too mentally modest to believe in the multiplication table. We are in danger of seeing philosophers who doubt the law of gravity as being a mere fancy of their own. Scoffers of old time were too proud to be convinced; but these are too humble to be convinced. The meek do inherit the earth; but the modern sceptics are too meek even to claim their inheritance."