The sermon emphasizes the importance of spiritual growth beyond initial faith, advocating for the diligent pursuit of knowledge as a vital component of a Christian life. Drawing from 2 Peter 1, the message highlights God's desire for believers to conform to the image of His Son through acquiring spiritual understanding, encompassing doctrine, reproof, correction, and instruction. Practical avenues for achieving this include consistent engagement with Scripture through reading, meditation, and memorization, ultimately leading to wisdom and a life that reflects God's truth.