Charles Spurgeon Commentary Revelation 21:6

"And he said unto me, They are come to pass. I am the Alpha and the Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely." — Revelation 21:6 (ASV)

Probably John did not expect to hear that sweet gospel message just then. The Lord Jesus Christ was speaking of lofty themes, of worlds newly made, and yet in the very middle of it all he puts this gracious promise. Let this be a pattern to all of you who are preachers or teachers: no matter what your subject may be, a gospel promise or invitation is always in place and in season. You may put it among the most golden sentences, like a precious stone in a setting of pure gold, and it will never be out of order, no matter when it comes.

Men hate God without the slightest reason for doing so, and God loves men without the slightest reason. There was every reason why men should love God and not hate him; yet they have hated him without a cause. And there is every reason why God should hate man and not love him. Yet he loves him so much that he gave his only-begotten Son to die, so that whoever believes in him may live forever.