Who said...
Pray that success will not come any faster than you are able to endure it.

Elbert Hubbard, US author 1856-1915

Jenny, thanks for adding who the person was rather than just giving his name. It makes the answer so much more interesting when there is more than just names.

You're right!

Thanks Dorian! Sometimes its difficult because most of my quotation books only give the name of who said it, not a history of that person.