Just as Parnassa is done so indifferently that it ends up being a chore, so too קבלת עול מלכות שמים on the highest level is where the person has no personal interest, only what Hashem wants, this als

Just as Parnassa is done so indifferently that it ends up being a chore, so too קבלת עול מלכות שמים on the highest level is where the person has no personal interest, only what  Hashem wants, this also overturns the sin of עגל which is עבודה זר