Read it through once

“his”, v. 5, the sun’s. “Yet human”, v. 6: though ‘kindred’ to the sun, yet proved ‘human’. . .‘when the first summons’, etc. “This is the same voice”, v. 11, i.e., a voice of the same import as was “the first summons”--one invoking help. The nouns “interchange”, “splendour”, “benediction”, vv. 17, 18, 19, are appositives of “what”, v. 17. “Never conclude”, v. 20, to be construed with “commence”, v. 13: “Never {may I} conclude”. “Their utmost up and on”, v. 23, to be construed with “yearn”, v. 21. “so”, v. 23, looks back to “raising hand and head”, etc. “Some whiteness” . . . v. 25, “Some wanness” . . . v. 26, to be construed with “blessing back”.