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Ezekiel in this second vision of the Lord of glory and the cherubim is impressed by the four wheels, one by each cherub. Eze. 10:9 Four is the number of the earth, four seasons, four points of the compass and so on. As we have noted these four men have been used of the Lord as a witness and testimony to the earth. Wheels are circular, having no beginning nor end. Thus we find the eternal, the everlasting nature of God represented by the wheels. Consider how many things in creation are circular, such as the sun, moon, stars, earth. The Lord has left signs of His nature in all of creation.
As for the wheel within the wheel, the hub represents the God who is a Spirit and is involved in all that is earthly and heavenly, time and eternity, there is no escape from His presence. He is the hub of all that is in existence. Christ, the name of the Holy Spirit, which was given to the Lord Jesus because of the anointing or the Spirit which He received of the Father and was without measure. John 3:34
Concerning the exact modern stone intended here and color of the wheels
there is a disagreement as to the actual stone. Some say that it was the chrysolite and that it was a yellow color like pure gold. Others believe that it was lapidaries or of the color of the sea, an azure blue. In the spiritual scheme of colors, both could well be accepted, for the golden yellow, is indicative of the Father while the blue is the color of the Holy Spirit. This would fit nicely with the vision give Daniel of the Lord, where He saw Him girded with fine gold and having the appearance of the beryl stone.
Dan. 10:6 This stone called chrysolite is also the seventh (the number of Divine completion) stone in the foundation of the true, eternal city, the New Jerusalem. While the beryl is the eighth (Number of resurrection) . Rev. 21:20 Either of which will greatly add to the beauty of that city.
A further reference is made to the wheels when a voice called out, ìO wheel.î Eze. 10:13 In Hebrew this is a different word regarding the wheel than that used previously. This word ìgalgalî is by analogy a whirlwind. A strong and sometimes dangerous circular action of the wind. It is used to indicate the mighty strength and total power which is made manifest to show forth the exceeding great power of the Almighty. Jesus said that all power in two realms, heaven and earth had been surrendered to Him. Mt. 28:18 It can be for a blessing, like on the day of Pentecost when they heard a rushing mighty wind and were filled with the Spirit. Acts 2:2 Or it can be an act of punishment from the Lord. Ps. 58:9.