Robert Cragg

Chapter 21
v.2 The Holy city is the bride of Christ, the church (see verses 9,10) as well as the abode of the saints.
Verses 3,4 The tabernacle and the description of the bliss of the saints indicate the unbroken fellowship between God and His people. Because of His presence there is no more sorrow.
Verses 5,6
God proclaims the completion of the newas well as the destruction of the old.
V.8 Cowardly: Courage and patient endurance are indispensable in the conflict between the Lamb and the dragon.
Unbelieving is the opposite of faithfullness.
Abominablemeans polluted by the Earths's abominations.
Sorcerers: The literal Greek refers to those dealing in drugs. Liars are those who deviate from the truth and join the deceivers.
V.10 High Mountain refers to the actual site of the Holy Jerusalem (see Ps. 48:1,2; Is. 2:2 Ezek. 40:2;48:12-16; Mic.4:1; Zech. 8:22; 14:16).
21: 11-14 Jasper see 4:3 The twelve gates are open in all directions to all peoples.
The twelve tribes plus the twelve apostles are the combined people of God, incorporating the Old and New, built on twelve foundations, the testimony of the eyewitnesses to the revelation of God ( see Eph.2:20).
Verses 15-17 The City is a perfect cube, a symbol of perfection, as was the Most Holy Place (see 1 Kings 6:20). The dimensions of 12 and 1,000 indicate that there will be perfect room for the redeemed.
Verses 18-21 The precious materials used in the construction of the city magnify its beauty and glory.
Verses 22,23
Neither temple nor created light is needed, because of the presence of God and the Lamb.
Verses 24-26 The city is perfect it is universality and its holiness.