The Hebrew word "amav" is related to the word "im’um," dimming or
growing dark, as in dying embers or coals that have been left to burn
out on their own. Serving G-d "dimly," halfheartedly and without fervor,
is the cause of all defilement and impurity. The Torah warns us against
allowing our G-dly spark to grow dim. Rather, it must be constantly
nurtured and rekindled.
(The Rebbe of Alexander)