failing = fainting. Greek apopsucho. Occurs only here. Luke used three compounds of the simple verb (psucho,Mat_24:12), all peculiar to him: e.g. "cool", Luk_16:24; "gave up the ghost", Act_5:5, Act_5:10; Act_12:23.
for = from. Greek. apo.App-104.
looking after = expectation. Greek prosdokia, from the verb prosdokeo.App-133.
earth = the inhabited earth. Greek. oikoumene.App-129.
the powers, &c. App-172. Probably refers to the angelic world rulers. See notes on Dan_10:13.
heaven = the heavens. See note on Mat_6:9, Mat_6:10.
shall be shaken. Compare Mat_11:7. Mat_6:38. ActsLuk_4:31. Heb_12:26, Heb_12:27.