Isaiah 63:7-14 reads like a Psalm of David and it functions like one, too. Isaiah’s memories are designed to shape our own memories. We are to remember God’s “steadfast love” (Isaiah 63:7-9); we’re to remember our terrible tendency to spurn God’s steadfast love (Isaiah 63:10). Finally, thankfully, God Himself (according to the ESV and KJV reading) remembers the time when He rescued His people. All that remembering is designed to lead God’s people to put an end to their rebellion and their grieving “His Holy Spirit.” Or, to use the language of Isaiah 63:14, the Psalm of Isaiah is designed to make sure all of us are being led by God. According to Romans 8:14, being led by the Spirit of God confirms that we belong to God. Paul can instruct his readers in Ephesians 4:30 to stop grieving the Holy Spirit because faith in Christ gives the desire and capacity to do so. Isaiah 63:9 previews the Gospel. Christ truly “was afflicted” on the cross and those who receive Him respond to His love by yielding to His Spirit.