Spiritual immaturity is a problem because God commands Christians to grow (2 Pet. 3:18), but also because true spiritual life inherently includes growth (2 Cor. 3:18). More importantly, however, spiritual immaturity could be an indication that we don't actually belong to Christ at all. For all these reasons, it is crucial for those who claim to be Christians that they be clear on the essentials of Christian truth and living, and that they be growing from that foundation into greater degrees of Christlikeness.