Sentence:  Certes sayd the good man that is sothe / for he shalle be the best knyghte of the world and the fairest of alle the felauship / But wete yow wel there shall none atteyne it but by <WSD>clennes</WSD> that is pure confession<!--Prior quote:But wyte you welle, there shall none attayne hit but by <WSD>clennes</WSD>, that ys pure confession.--> 
Meaning of the word marked with <WSD> tags:  Moral purity; innocence.