Revelation 21:6

And he said unto me, It is done. — Or, rather, They (the things promised) have come to pass. He spake, and it was done. The assurance is made trebly sure. “I am making all things new.” “These words are true.” “They are fulfilled.” “Twice,” says Bengel, “twice it is said in this book ‘It is done.’ First at the completion of the wrath of God in Revelation 16:17, and here again at the making of all things new.”

I am Alpha and Omega, the beginning and the end... — The definite article must be placed before Alpha and Omega. I am the Alpha and the Omega, the beginning and the end. He is the Alpha and Omega, whose words are faithful and true, and He is the beginning and the end, who is before all things and by whom all things consist (Colossians 1:17; John 1:1). He finishes as well as begins. He who begins the good work will perform it (Philippians 1:6; Colossians 1:20); all grace flows from Him; and all love flows back to Him, who is Love, who is the cause and end of all, who first makes us, and lastly makes us rest in Him. All the unsatisfied yearnings of the heart may find satisfaction in Him. Hence, perhaps, this promise, I to him that thirsteth will give out of the spring of the water of life freely. No promise shall fail — the needy and thirsty so often invited to Him may find fresh springs of life in Him. (Comp. Isaiah 55:1; John 4:10; John 7:37.) The blessing is promised freely, as an unbought gift, without money and without price. This is the genius of the good news of God — the gift is free to all. He who understands this will not be afraid to say, “Nothing in my hand I bring;” and he who says this will be he who will also say, “What things were gain to me, those I counted loss for Christ,” so that he who brings everything brings nothing; and he who brings nothing brings everything, knowing that all is nothing.