John Gill emphasizes the importance of spiritual growth in his sermon on 1 Peter 2:2, urging believers to desire the pure milk of the Word as newborn babes. He explains that this desire is not merely for knowledge but for the nourishing and restorative power of the Gospel, which is essential for spiritual maturity. Gill highlights that all believers, regardless of their time in faith, are to approach God with humility and innocence, seeking the truth that leads to growth in grace and knowledge of Christ. The ultimate goal of this longing for the Word is to attain salvation and fullness in Christ. He encourages the congregation to cultivate a deep, sincere desire for the Word, which is vital for their spiritual development.