"Stan Lee; An outspoken interview with 'The Man' from Marvel", interveiw conducted by John Weber. Dated July 3, 1987
Spider-Man from the beginning was deemed one of Marvel's most successful characters. But according to Stan Lee heroes never can have thier own happy ending, which makes writing thier stories so interesting. Lee states that one of his tests with writing comic strips is when he starts to get bored, this is when the character could change drastically or that storyline would end.