By necessity, by proclivity, and by delight, we all quote. In fact, it is as difficult to appropriate the thoughts of others as it is to invent.
As far as the education of children is concerned I think they should be taught not the little virtues but the great ones. Not thrift but generosity and an indifference to money; not caution but courage and a contempt for danger; not shrewdness but frankness and a love of truth; not tact but love for one's neighbor and self-denial; not a desire for success but a desire to be and to know.