Scholars though have disagreements about the end for which the Platonic theory is used. In "the usual interpretation of an elliptical construction," the ending couplet expresses further praise for the youth, seeming to say that while all things beautiful are shades of the youth, the youth like nothing else, is distinguished by a constant, faithful heart. Considering the sonnets expressing betrayal in Sonnets 40-42, this sonnet extolling the youth's constancy seems absurd for some scholars and is problematic. Seymour-Smith suggests that the last line should be interpreted: "you feel affection for no one, and no one admires you for the virtue of constancy". Duncan Jones agrees and suggests that the word "but" at the beginning of the closing line radically changes all that has gone before and marks a turn to a more critical perspective.