Blessed are the PURE in heart

Hey, guys, it's been a while
So I decided to do some writings in the midst of all my business and activities

Well, writing is fun

Anyway, here we go, Matthew 5:8

Blessed are the pure in heart: for they shall see God - Matthew 5:8

As you can see, the word 'pure' here (katharos) has this meaning:
clean, pure
physically
purified by fire
in a similitude, like a vine cleansed by pruning and so fitted to bear fruit
in a levitical sense
clean, the use of which is not forbidden, imparts no uncleanness
ethically
free from corrupt desire, from sin and guilt
free from every admixture of what is false, sincere genuine
blameless, innocent
unstained with the guilt of anything

Such an interesting definition: Purified by fire

My first question was: What is this purificating fire? Process? Certain (religious) activities? Meditating?
While the fact is:
"The heart of man is naturally unclean; nor is it in the power of man to make it clean, or to be pure from his sin; nor is any man in this life, in such sense, so pure in heart, as to be entirely free from sin." - Gills Exposition

There must be something to be done in order to purify our unclean state!

Bear with me, we'll continue reading other verses
1 John 1:7 clearly states:

But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.

Ephesians 1:13-14

13And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit,
14who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory.

Hebrew 12:29

For our God is a consuming fire.

John Wesley stated: For our God is a consuming fire - in the strictness of his justice, and purity of his holiness.

See what I mean?

Through Jesus, something is done to us!

This very concept of Jesus' sacrifice as the Lamb of God explains a LOT about the concept of grace God's given us (eternal salvation).
Despite being naturally unclean and failing to do God's justice, by accepting Jesus, we are purified by God's spirit (fire) and hence we become clean (katharos)

Next: "For they shall see God"

See (Horao):
to see with the eyes
to see with the mind, to perceive, know
to see, i.e. become acquainted with by experience, to experience
to see, to look to
to take heed, beware
to care for, pay heed to
I was seen, showed myself, appeared

Of course we still remember how Esther was struggling in order to see the King Ahasyweros:

"Go, gather together all the Jews who are in Susa, and fast for me. Do not eat or drink for three days, night or day. I and my attendants will fast as you do. When this is done, I will go to the king, even though it is against the law. And if I perish, I perish." - Esther 4:16

There's consequency in seeing the King without permission, not a pleasant one for sure. (Moreoever seeing the King of all kings)

And when the king saw Queen Esther standing in the court, she won favor in his sight, and he held out to Esther the golden scepter that was in his hand. Then Esther approached and touched the tip of the scepter. - Esther 5:2

It's even possible that we (she) did not win favour in King's sight and therefore got banished/killed

Seeing the king's face is a Hebrew expression:

2 Kings 1:19,"Those that stood in the king's presence;" in the Hebrew, those that saw the face of the king; that is, who were his favorites and friends. So here, to see God, means to be his friends and favorites, and to dwell with him in his kingdom. - Barne's Notes

John Gills added to Mat 5:8

(see the God) In this life, enjoying communion with him, both in private and public, in the several duties of religion, in the house and ordinances of God; where they often behold his beauty, see his power and his glory, and taste, and know, that he is good and gracious: and in the other world, where they shall see God in Christ, with the eyes of their understanding; and God incarnate, with the eyes of their bodies, after the resurrection; which sight of Christ, and God in Christ, will be unspeakably glorious, desirable, delightful, and satisfying; it will be free from all darkness and error, and from all interruption; it will be an appropriating and transforming one, and will last for ever - Gills Exposition

My last question: Are you friends of God (pure in heart)?