When I sang No. 4 of Elijah, "If with all your hearts" ...ye truly seek Me, ye shall ever surely find me...
I remembered Dr. Tong's "神找人，不是人找神". Of course, it is not to be applied in this context. As that reference related to those corrupt men who imagine their own gods.
Then there is this question, where in the Bible did Mendelssohn's piece is referring to...Of course, it is based on "Seek and ye shall find..." Matthew 7:7.
After a quick search, a prominent verse to support the lyrics is found in: Deuteronomy 4:29, Jeremiah 29:12-13.
Although, I wish I could find a site with all scriptural references for this oratorio. So I shall also include this entry in the Qestions category.