"It is the mark of an educated mind to be able to
entertain a thought without accepting it."
"The roots of education are bitter, but the fruit
is sweet."
"It is the mark of an instructed mind to rest assured
with that degree of precision that the nature of the subject admits,
and not to seek exactness when only an approximation of the truth is
possible."
". . . the life of the mind is divine in comparison
with mere human life. We should not follow popular advice and, being
human, have only mortal thoughts, but should become immortal and do
everything toward being the best in us."
"The least initial deviation from the truth is multiplied
later a thousandfold."
"With regard to excellence, it is not enough to know,
but we must try to have and use it."