"Nothing in the world can take the place of Persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan 'Press On' has solved and always will solve the problems of the human race."
-- Calvin Coolidge 30th president of US
I would like to know when and where he said this. My internet searching skills are basically limited to wikipedia.
Does anyone have any thoughts on where/how to find this?
Thanks in advance.