And forgettest the Lord thy Maker - These verses are designed to rebuke that state of the mind - alas! too common, even among the people of God - where they are intimidated by the number and strength of their foes, and forget their dependence on God, and his promises of aid. In such circumstances God reproves them for their want of confidence in him, and calls on them to remember that he has made the heavens, and has all power to save them.
That hath stretched forth the heavens - (See the notes at Isaiah 40:12, Isaiah 40:26).
And hast feared continually every day - They had continually feared and trembled before their oppressors.
Because of the fury of the oppressor - Those who had oppressed them in Babylon.
As if he were ready to destroy - Margin, ‘Made himself ready,’ The idea is, that he was preparing to destroy the people - perhaps as a marksman is making ready his bow and arrows. The oppressor had been preparing to crush them in the dust, and they trembled, and did not remember that God was abundantly able to protect them.
And where is the fury of the oppressor? - What is there to dread? The idea is, that the enemies of the Jews would be cut off, and that they should therefore put their confidence in God, and rely on his promised aid.