T. Austin-Sparks emphasizes that the message of the prophets was not apprehended by the people because they were unwilling to accept the concept of a suffering Messiah, which is central to the Gospel. He explains that the offense of the Cross leads to a personal and national rejection of the true nature of Christ, resulting in a lack of spiritual understanding. Sparks highlights that true knowledge of the Lord comes through the application of the Cross in our lives, which requires self-emptying and a willingness to let go of worldly desires. He urges believers to seek a deeper relationship with God, which is foundational for effective service in His Kingdom. Ultimately, the Cross is presented as essential for spiritual growth and understanding, leading to a more profound knowledge of the Lord.