J.R. Miller emphasizes the distinction between childlikeness and childishness, urging believers to embrace the former while rejecting the latter. He highlights that childlikeness embodies humility, simplicity, and trust, which are essential for entering the kingdom of Heaven, while childishness represents immaturity and weakness that should be left behind as one matures. Miller illustrates how adult behaviors such as pouting, jealousy, and envy reflect a failure to grow up spiritually, and he encourages individuals to cultivate a spirit of grace and humility instead. He calls for a commitment to put away childish behaviors and to embrace a more mature, Christlike disposition in all aspects of life.