The Confidence Man - Herman Melville
http://www.online-literature.com/melville/confidence-man/7/
Such goodness seemed his, allied with such fortune, that, so far as his own personal experience could have gone, scarcely could he have known ill, physical or moral; and as for knowing or suspecting the latter in any serious degree (supposing such degree of it to be), by observation or philosophy; for that, probably, his nature, by its opposition, imperfectly qualified, or from it wholly exempted.
I understand the sentence, but still I have some questions:
1 by "its opposition" does he mean the contrary to his nature, that is ill-natured?
2 what "it" stands for in "...or from it wholly exempted?
3 what "words" did he ellide in the second and third part of the sentence, if allowing for ellipsises?