What’s a possible answer to this question: Why did the Lord send an evil Spirit or a harmful Spirit on Saul?
The Spirit of the Lord departed from Saul as soon as the Lord’s Spirit came upon David to anoint him for kingship (see v. 13). This statement is not relevant to the issue of whether people can lose their salvation; it is not describing the Holy Spirit’s role in individual regeneration in a NT sense.
Rather, in light of v. 13, it should be seen as being about gaining or losing the Spirit’s empowering for the role of king (see Ps. 51:11). From this point, to the end of his life, Saul will continually make futile attempts to govern without the empowering of the Holy Spirit.
So the harmful spirit sent by the Lord to torment Saul was a form of judgment for his sin of turning against the Lord (1 Sam. –29). Though God himself never does evil, he sometimes sends evil agents to accomplish his purposes.
Would God still work this way? I think the answer is yes. Rebellion against God's will and word in our lives strips us of inner peace and joy. When we stand opposed to God's will we experience deep levels of unhappiness. In essence, we quench the sweet, sweet Spirit of God in our lives. This is what happened to Saul and yes, the same can happen to us and even to a congregation.
The only way to turn this around is repentance. Come before the Lord; acknowledge the sin of rebellion and beg for his forgiveness. In Psalm 51:11, David prayed like this, "Take not your Holy Spirit from me; restore to me the joy of your salvation, and renew a right spirit within me."
Let the Lord have his way in your life everyday; there's no rest, there's no peace until the Lord has his way. Place your life in His hands; rest secure in God's plan and let the Lord, let the Lord have his way (Old time Jamaican hymn).
Question: Have you ever quenched the Spirit of God in your life? How did you find renewal in your life?