The following quote is from an interview Justin Taylor did with Tullian Tchividjian. It addresses the importance of both head and heart in the Christian life.
God has equipped Christian’s with both a head and a heart, intellectual capacities along with emotional capacities, we understand that no one can feel rightly about God without thinking rightly about God. On the other hand, we also believe no one can think rightly about God without feeling rightly about God. Therefore, we are seeking, in everything we do, to combine gravity and gladness, depth and delight, doctrine and devotion, precept and passion, truth and love (Matt. 22:37; John 4:23-24; 1 Cor. 14:15; Eph. 4:15). We want to be a community that glorifies God in the way that we think and the way that we feel. We desire to be a church that thinks and feels theologically while seeking to avoid both intellectualism and emotionalism.