So we must worship in both spirit and truth, with both heart and head, with both emotions and thought. If we worship too much just by spirit we will be mushy and soft on the truth, worshipping according to feelings. That can lead anywhere from a sleepy tolerance of anything in worship at one extreme to uncontrollable spiritual wildfire on the other. But if we worship by truth without the spirit, then our worship will be taut, grim, and icily predictable. – Don Whitney