Here is a verse found on an old bookplate that I feel that would serve as a sort of a "grace" for a new book:
May this volume continue in motion,
And its pages each day unfurl'd,
Till an ant has drunk up the ocean,
Or a tortoise has crawl'd round the world.
Long live writers and long live your book. If you want to write a book that lasts until the ants drink up the ocean, join the Ligonier Valley Writers. For more information go to lvwonline.com