"Worshipping in spirit is the opposite of worshipping in merely external ways. It is the opposite of empty formalism and traditionalism. Worshipping in truth is the opposite of worship based on an inadequate view of God. Worship must have hear and head. Worship must engage emotions and thought."
"Truth without emotion produces dead orthodoxy and a church full (or half-full) of artificial admirers (like people who write generic anniversary cards for a living). On the other hand, emotion without truth produces empty frenzy and cultivates shallow people who refuse the discipline of rigorous thought. But true worship comes from people who are deeply emotional and who love deep and sound doctrine. Strong affections for God rooted in truth are the bone and marrow of biblical worship."~ John Piper, Desiring God