He shows the exceeding holiness of God.
He teaches the exceeding corruption and infirmity of our nature.
He strips us of our blind self-righteousness.
He opens our eyes to our awful guilt, folly and danger.
He fills the heart with sorrow, contrition, and abhorrence for sin; as the abominable thing which God hates.
He who knows nothing of all this, and saunters carelessly through life, thoughtless about sin, and indifferent and unconcerned about his soul, is a
dead man before God! He has not the Holy Spirit.
John 16:8 ... And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:
Luke 6:43-44 ... For a good tree bringeth not forth corrupt fruit; neither doth a corrupt tree bring forth good fruit. For every tree is known by his own fruit. For of thorns men do not gather figs, nor of a bramble bush gather they grapes.