Occurrences in this domain are beyond the reach of exact prediction because of the variety of factors in operation, not because of any lack of order in nature.

Logic will get you from A to B. Imagination will take you everywhere.

I am thankful for all of those who said NO to me. It’s because of them I’m doing it myself.

We shall require a substantially new manner of thinking if mankind is to survive.

A hundred times every day I remind myself that my inner and outer life depend on the labours of other men living and dead and that I must exert myself in order to give in the same measure as I have received.

A man's value to the community depends primarily on how far his feelings, thoughts, and actions are directed towards promoting the good of his fellows.