We are all citizens of one world, we are all of one blood. To hate people because they were born in another country, because they speak a different language, or because they take a different view on this subject or that, is a great folly. Desist, I implore you, for we are all equally human. . . . Let us have but one end in view: the welfare of humanity.

Let us have but one end in view, the welfare of humanity; and let us put aside all selfishness in consideration of language, nationality, or religion.

Boyhood is distracted for years with precepts of grammar that are infinitely prolix, perplexed and obscure.

Not the children of the rich or of the powerful only, but of all alike, boys and girls, both noble and ignoble, rich and poor, in all cities and towns, villages and hamlets, should be sent to school

Three things give the student the possibility of surpassing his teacher: ask a lot of questions, remember the answers, teach.

The saying "He who teaches others, teaches himself" is very true, not only because constant repetition impresses a fact indelibly on the mind, but because the process of teaching itself gives deeper insight into the subject taught.

Much can be learned in play that will afterwards be of use when the circumstances demand it.