'Sufficiency' relates to the reception of good, because good is the spiritual nourishment of the soul, as natural food is the nourishment of the body.

(References: Apocalypse Explained 376 [1-40])

A 'thousand' means much, many, a countless number, a whole era of time, an abundance. When used in reference to the Lord, it actually means a number greater than that: In those cases it means what is infinite, what is truly without end.