Hast,' a past tense. It is as good as done. The believing use of God's great
past, and initial mercy, to make us sure of His future. (a) In that He will certainly accomplish it.
(b) In that even now there is a foretaste--rest in toil. He guides to the waters of resting.' A rest now (Heb. 4:3); a rest' that remaineth (Heb. 4:3-9).