Sentence:  Without <WSD>morality</WSD>, intellect were impossible for him; a thoroughly immoral "man" could not know anything at all! To know a thing, what we can call knowing, a man must first "love" the thing, sympathize with it: that is, be "virtuously" related to it. 
Meaning of the word marked with <WSD> tags:  Recognition of the distinction between good and evil or between right and wrong; respect for and obedience to the rules of right conduct; the mental disposition or characteristic of behaving in a manner intended to produce morally good results.