"A great gulf, however, has been opened between man's material advance and his social and moral progress, a gulf in which he may one day be lost if it is not closed or narrowed"

This quote by Lester B. Pearson speaks with the detach between the material progress of humankind and its social and moral development. It recommends that while mankind has made great strides in terms of material improvement, such as technological and clinical development, it has not equaled its social and ethical progress. This gap in between material and social/moral development has actually developed a gulf that Pearson alerts might result in mankind's failure if it is not resolved. He suggests that this gulf needs to be closed or narrowed in order to ensure mankind's survival. This quote speaks with the significance of not just material development, however likewise social and moral progress, in order to guarantee the future of mankind.