I want to compare the features of a single person. The following sentence should describe a person. The person is very clever but at the same time, this person is insane. I mean this madness in his had helps him to be genius and the madness is more positive than negative.
He is as clever (genius) as he is insane.
And I'm not sure that sentence above is correct.
What grammar structure should I use to compare incomparable things of one person? Should I use any phraseology in this case?