When Jesus says they will do even greater things once He has left, how is that possible when all we have is the promise of the Holy Spirit. Do we underestimate the person, presence and power of the Holy Spirit in our lives? The Spirit has transforming power in the lives of believers, producing holiness and likeness to Jesus (Sanctification). It is the Holy Spirit who can pray and intercede for us (Intercession). The Holy Spirit is our teacher and guide who is sent by the Father (Teacher & Guide).