pure. The texts omit.
water of life. i.e. living water.
life. App-170.
out of. App-104.
throne. The throne of the great Priest-King (Zechariah 6:13) of the "thousand years" now gives place to the glorious "throne of God and of the Lamb", for God is now "all in all". Contrast Ezekiel 47:1-11, where the river proceeds from the "house" associated with the altar; here, from the throne.
God. App-98.