A.W. Tozer emphasizes that individuals are as holy and filled with the Spirit as they truly desire to be, based on the teaching of Jesus in Matthew 5:6. He explains that true hunger and thirst for righteousness can lead to a profound filling by the Holy Spirit, but many Christians remain complacent in their spiritual state. Tozer encourages believers to cultivate a deep longing for God, recognizing that the key to spiritual fulfillment lies in the intensity of their desire for Him. He calls for a heartfelt prayer for a holy longing that allows the Spirit to fill the void in their lives.