Seriously, this post exists purely for the almost entirely pointless reason of arguing quite emphatically that at no time should you ever say "There is a fine line between genius and madness" or "All genius is tinged with a little madness" or anything of the sort.
There is a vast and depressingly tragic gulf between genius and madness. Madness is not nice, not cool, not helpful and should not be bandied about like that. Madness leads to drug abuse, unemployment, violent paranoia, homelessness and alienation. Madness leads to jail time. It is possible to be an absent-minded professor, but it is not possible to be a mad genius. It just doesn't work like that.