[Romulus]

When I noticed that the wind had closed the book I was (and continue to be) filled with a mixture of holy awe and fear.

In the rubrics of the old rite, the closing of the book formally signifies the end of the liturgy. In iconography, the depiction of the Lord with closed book frequently signifies the Last Judgment, when the time for evangelisation will be over.

[lightman]

Those feelings have intensified upon reading your post.

[Kolokotronis]

The above is a modern icon of Christ at the Last Judgment by Nicholas Pappas and is in Saint Michael's Orthodox Church in Greensburg, Pennsylvania. Note the closed Gospel Book.