What is the difference between grieving the Spirit and quenching the Spirit? They almost certainly overlap. But if there is a difference, it is probably this: we grieve the Spirit by our relationships with one another – like judging and unforgiveness; we quench the Spirit when we are prejudiced towards the way the Spirit may be manifesting Himself and by not respecting His presence. It is usually fear that lies behind quenching the Holy Spirit.
R.T. Kendall