Every man who rises above the common level has received two educations: the first from his teachers; the second, more personal and important, from himself.
“The bargain that yields mutual satisfaction is the only one that is apt to be repeated.”
“Ideas which have been developed simultaneously or in immediate succession in the same mind mutually reproduce each other, and do this with greater ease in the direction of the original succession and with a certainty proportional to the frequency with which they were together.”