C. I. Lewis

"A "poor evaluation" of the probability of anything may reflect ignorance of relevant data which "ought" to be known."

—C. I. Lewis (1883-1964)

"There is no such thing as the probability of four aces in one hand, or the probability of anything else. Given all the relevant data which there are to be known, everything is either certainly true or certainly false."

—C. I. Lewis (1883-1964)

"The only knowledge a priori is purely analytic; all empirical knowledge is probable only."

—C. I. Lewis (1883-1964)

"If there is any knowledge at all, some knowledge must be apriori."

—C. I. Lewis (1883-1964)

"Knowing begins and ends in experience; but it does not end in the experience in which it begins."

—C. I. Lewis (1883-1964)

"Empirical knowledge is exclusively a knowledge of probabilities..."

—C. I. Lewis (1883-1964)