This excerpt is from Nietzsche's book, 'Thus Spoke Zrathustra':
I do not want to be confused with these preachers of equality, nor taken for one of them. For justice speaks thus to me: 'Men are not equal.' And they should not become so, either! For what were my love of the Superman if I spoke otherwise?
I don't have any clue what's the meaning of the sentence, 'For justice speaks thus to me'.
The book link here.