St. Michael to Adam on the purpose of the Law

a gem from Paradise Lost

From Paradise Lost XII:285-314, St Michael to Adam about the purpose of the Law:

To whom thus Michael. Doubt not but that sin
Will reign among them, as of thee begot;
And therefore was law given them, to evince
Their natural pravity, by stirring up
Sin against law to fight: that when they see
Law can discover sin, but not remove,
Save by those shadowy expiations weak,
The blood of bulls and goats, they may conclude
Some blood more precious must be paid for Man;
Just for unjust; that, in such righteousness
To them by faith imputed, they may find
Justification towards God, and peace
Of conscience; which the law by ceremonies
Cannot appease; nor Man the mortal part
Perform; and, not performing, cannot live.
So law appears imperfect; and but given
With purpose to resign them, in full time,
Up to a better covenant; disciplined
From shadowy types to truth; from flesh to spirit;
From imposition of strict laws to free
Acceptance of large grace; from servile fear
To filial; works of law to works of faith.
And therefore shall not Moses, though of God
Highly beloved, being but the minister
Of law, his people into Canaan lead;
But Joshua, whom the Gentiles Jesus call,
His name and office bearing, who shall quell
The adversary-Serpent, and bring back
Through the world’s wilderness long-wandered Man
Safe to eternal Paradise of rest.

Wow.