8. Messiah is represented as having asked for the grace of God in behalf of sinners; this verse contains God the Father's favorable answer.
      an acceptable time--"In a time of grace" [HENGSTENBERG]. A limited time (Isa 61:2; 2Co 6:2). The time judged by God to be the best fitted for effecting the purposes of His grace by Messiah.
      heard thee-- (Ps 2:8; Heb 5:7).
      day of salvation--when "the fulness of time" (Ga 4:4) shall have come. The day of salvation is "to-day" (Heb 4:7).
      helped--given Thee the help needed to enable Thee, as man, to accomplish man's salvation.
      preserve--from the assaults and efforts of Satan, to divert Thee from Thy voluntary death to save man.
      covenant of the people--(See on Isa 42:6). "The people," in the singular, is always applied exclusively to Israel.
      establish the earth--rather, "to restore the land," namely, Canaan to Israel. Spiritually, the restoration of the Church (the spiritual Israel) to the heavenly land forfeited by man's sin is also included.
      cause to inherit . . . desolate heritages--image from the desolate state of Judea during the Babylonish captivity. Spiritually, the Gentile world, a moral waste, shall become a garden of the Lord. Literally, Judea lying desolate for ages shall be possessed again by Israel (compare Isa 61:7, "in their land"). Jesus, the antitype of, and bearing the same name as Joshua (Heb 4:8), shall, like him, divide the land among its true heirs (Isa 54:3; 61:4).

JFB.