But all subsists by elemental strife;
  And passions are the elements of life.

COLON.

RULE 1.  The three great enemies to tranquillity, are vice, superstition, and idleness:  vice, which poisons and disturbs the mind with bad passions; superstition, which fills it with imaginary terrors; idleness, which loads it with tediousness and disgust.