In the song Great is Thy faithfulness there is a line that reads
Join with all nature in manifold witness
What does that mean? What is manifold witness?
"Manifold" has the meaning of :
The fact that the "sun, moon, and stars", are joining the whole of nature as a witness(like in a court)of God's great faithfulness, mercy, and love. Because it is the "whole of nature", this witness is bound to be composed of "many different elements".