Satan is constantly working to lead men to deny the light. It is but a step from the straightforward path to a diverging one, in which Satan leads the way, and where light is all darkness, and darkness light.... It is a dangerous thing to open the heart to unbelief, for it drives the Spirit of God away from the heart, and Satan′s suggestions come in.... We must ... avoid the first admission of doubt and unbelief. (OHC 26.3) MC VC