Avrtam jnanam etena jnanino nitya-vairina
kama rupena kaunteya duspurenanalena ca
(Text 39, Ch 3, Karma Yoga)
Meaning: Thus wise living entity’s pure Consciousness becomes covered by his eternal enemy in the form of lust, which is never satisfied and which burns like fire.
***According to Manu-smrti, lust cannot be satisfied by any amount of sense enjoyment, just as fire is never extinguished by a constant supply of fuel.
Advancement of material civilization on the basis of sense gratification means increasing the duration of the material existence of a living entity.Therefore lust is the symbol of ignorance by which the living entity is kept within the material world.