
As quoted in Thomas A. Edison, Benefactor of Mankind : The Romantic Life Story of the World's Greatest Inventor (1931) by Francis Trevelyan Miller, Ch. 25 : Edison's Views on Life — His Philosophy and Religion, p. 295.
Context: We really haven't got any great amount of data on the subject, and without data how can we reach any definite conclusions? All we have — everything — favors the idea of what religionists call the "Hereafter." Science, if it ever learns the facts, probably will find another more definitely descriptive term.