"There are three ways of trying to win the young. You can preach at them—that is a hook without a worm. You can say, "…"

"What is it that is done to our children that their puberty should deform them? They have the joy of movement; they ha…"

"There can be no doubt that the youth of today have to be protected against certain poisonous effects inherent in pres…"

"Whenever you have to deal with a boy who is a rebel, remember that you must not fail at some time or other to get him…"

"I regard it as the foremost task of education to insure the survival of these qualities: an enterprising curiosity, a…"

"It is a sin of the soul to force young people into opinions … but it is culpable neglect not to impel young people in…"

"The passion of rescue reveals the highest dynamic of the human soul."

"It is true that mathematics, owing to the fact that its whole content is built up by means of purely logical deductio…"

"Mathematical knowledge, therefore, appears to us of value not only in so far as it serves as means to other ends, but…"

"Out of the interaction of form and content in mathematics grows an acquaintance with methods which enable the student…"