Charles Spurgeon Commentary Ephesians 4:30

"And grieve not the Holy Spirit of God, in whom ye were sealed unto the day of redemption." — Ephesians 4:30 (ASV)

And grieve not the Holy Spirit of God, whereby ye are sealed unto the day of redemption.

The Holy Spirit's being in you is your seal that you are the child of God, and the power by which you will be preserved until the resurrection; therefore, do not grieve that blessed Spirit.