In life, some of those are anxiety, comparison (which can lead to envy) fear, (of an unknown future) and greed. All of these "poisons of discontent" can stymie ones life of simplicity and thwart spiritual growth, as well.
There are also those dregs from the past that hold us back & keep us prisoners to those "if only" thoughts........ ; diasppointments, failures, regret and unforgiveness.
Rob Bugh, pastor at Wheaton Bible Church, says, "A lack of forgiveness keeps you walking through life backwards and you miss what is in front of you----the joy of the present,"
Trying to brew life afresh so that you con enjoy the moment............... discard those dregs!