A normal, free thinking person does not like to be manipulated to justify another's end result. And yet, as Chritians we are being changed by a means to an end. Christ is the means. Salvation is the end. This is not a manipulation. Change occurs because the Holy Spirit was invited in and accepted as the means. Manipulation uses a forced motivator. God uses love, an inborn pull.
If you lose a sense of purpose in a system you belong to or are paid by, you feel more a slave than a partner. God's true purpose is to say YES to His enterprise and kingdom growth. SEE: 2 Cor. 1:20.