Jamieson, Fausset and Brown on Song of Solomon 2:9

9. he standeth--after having bounded over the intervening space like a roe. He often stands near when our unbelief hides Him from us (Ge 28:16; Re 3:14-20). His usual way; long promised and expected; sudden at last: so, in visiting the second temple (Mal 3:1); so at Pentecost (Ac 2:1, 2); so in visiting an individual soul, Zaccheus (Lu 19:5, 6; Joh 3:8); and so, at the second coming (Mt 24:48, 50; 2Pe 3:4, 10). So it shall be at His second coming (1Th 5:2, 3).

wall--over the cope of which He is first seen; next, He looks through (not forth; for He is outside) at the windows, glancing suddenly and stealthily (not as English Version, "showing Himself") through the lattice. The prophecies, types, &c., were lattice glimpses of Him to the Old Testament Church, in spite of the wall of separation which sin had raised (Joh 8:56); clearer glimpses were given by John Baptist, but not unclouded (Joh 1:26). The legal wall of partition was not to be removed until His death (Ep 2:14, 15; He 10:20). Even now, He is only seen by faith, through the windows of His Word and the lattice of ordinances and sacraments (Lu 24:35; Joh 14:21); not full vision (1Co 13:12); an incentive to our looking for His second coming (Is 33:17; Tit 2:13).