That they may see; or, that men may see; for it is an indefinite expression. The sense is, that all that see this wonderful change may consider it, and may know that this is the work of God alone.
Related Commentaries of Isaiah 41:20
Isaiah 41:20
20 That they may see, and know, and consider, and understand together, that the hand of the LORD hath done this, and the Holy One of Israel hath created it.