Don't remove it!

Between the request for an established spirit and a willing, or free, spirit is the plea that God should not take his holy spirit from David, In other words, the key to the new spirit that David is asking for is the presence of God’s Spirit. It seems probably that this request grows out of the memory of Saul, a memory that must have gained a horrifying power at this time in David’s life. For once Saul had been dramatically filled with God’s Spirit, as David had been after him. But then through disobedience and rebellion, Saul had lost that intimate presence, and the vacuum had been filled with an altogether different spirit. — Called to be Holy, page 70