“That which is has already been, and what is to be has already been; and God requires an account of what is past.” The first part of this verse is almost identical to the first half of Ecclesiastes 1:9 and has already been discussed on Day 1 of my study through Ecclesiastes.
But the second half of the verse is significant, especially in the context of chapter three and the entire book: “And God requires an account of what is past.”
