It's hardly possible to overstate the value, in the present state of human improvement, of placing human beings in contact with other persons dissimilar to themselves, and with modes of thought and action unlike those with which they are familiar. Such communication has always been... one of the primary sources of progress.
John Stuart MillThe beliefs which we have most warrant for, have no safeguard to rest on, but a standing invitation to the whole world to prove them unfounded.
John Stuart MillThe pupil who is never required to do what he cannot do, never does what he can do.
John Stuart MillNo great improvements in the lot of mankind are possible until a great change takes place in the fundamental constitution of their modes of thought.
John Stuart Mill