Revelation 21:18

18 And the building of the wall of it was of jasper: and the city was pure gold, like unto clear glass.

John has completed the measurements of the city and its walls.  He is now describing composition of the wall and city.

The wall is composed of jasper and gold.  Its appearance is as clear glass, transparent.

Jasper is the Greek word iaspis (G2393).  It is in the Bible four times.  All of which are in Revelation, once in Revelation 4:3.

3 And he that sat was to look upon like a jasper and a sardine stone: and there was a rainbow round about the throne, in sight like unto an emerald.

In Revelation 4:3, this is describing the one that sat on the throne.  Revelation 21 is describing the city, the Bride of Messiah that is made up of the best of the best believers.  Jasper is found next in Revelation 21:11.

11 Having the glory of God: and her light was like unto a stone most precious, even like a jasper stone, clear as crystal;

The meaning of the jasper in Revelation 21:18 is similar to that of Revelation 21:11.  As the light of God shines through the wall of the city, the Bride; it will be like a jasper stone, clear as crystal.  It will be clear, because there will be no deception.  This describes the Bride of Messiah as transparent people.  They have nothing to hide.  They have lived a life consistent with that of the Bible and God’s Spirit.  When one looks on the walls of gold they will see the works of God that were wrought through these believers, because they were truly servants of God.  It will be as if looking through pure glass and seeing Messiah Himself in the testimony of their lives.  It is glass because it is transparent, no deception whatsoever.

Clear comes from the Greek word katharos (G2513).  It means physically clean as purified by fire.  It can denote something similar to a vine cleansed by pruning and so fitted to bear fruit.  Further, it can refer to clean in a Levitical sense.  As to be ethically free from corrupt desire, from sin and guilt free from every admixture of what is false.  It is sincere, genuine, blameless, innocent, unstained with the guilt of anything.  These are the various uses of katharos (G2513).  In total, this conveys the characteristic of those that make up the Bride and the strength of their sanctification.

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