Did you check out last week's sedra? (eikev) (10:16) 'umaltem es orlas levavchem' - you shall cut away the barrier (as in orla of a bris) of your heart. The artscroll footnotes say, 'figuratively, the heart is the seat of desire and emotion and when people become habitual sinners so that their impulses for holiness are weakened, it is described metaphorically as if the heart is surrounded by a covering that dulls its spiritual perceptions'.
Also, the previous passuk i mentioned (Devorim, 30:6) has the roshei teivos for elul making the coming weeks the perfect time for your work in this regard! 'umol Hashem Elokecho Es Levavcho Ve'es Levav zarecho' . This is pointed out in the mishna berurah in the introduction to siman 581 (the 1st of hilchos rosh hashono).
Hope thats helpful!