Charles Spurgeon Commentary Revelation 22:18-21

"I testify unto every man that heareth the words of the prophecy of this book, if any man shall add unto them, God shall add unto him the plagues which are written in this book: and if any man shall take away from the words of the book of this prophecy, God shall take away his part from the tree of life, and out of the holy city, which are written in this book. He who testifieth these things saith, Yea: I come quickly. Amen: come, Lord Jesus. The grace of the Lord Jesus be with the saints. Amen." — Revelation 22:18-21 (ASV)

For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book: and if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book. He which testifieth these things saith, Surely I come quickly.

Amen. Even so, come, Lord Jesus. The grace of our Lord Jesus Christ be with you all. Amen.

So the blessed Book closes appropriately with grace, for it is grace that-

"All the work shall crown
Through everlasting days;
It lays in heaven the topmost stone,
And well deserves the praise."