A.W. Tozer emphasizes the importance of discerning what we read, warning against shallow and harmful literature that fails to nourish the soul. He distinguishes between high-quality intellectual works and the trivial, entertaining religious content that can lead to a parasitic mindset. Tozer encourages readers to engage with serious literature that challenges and enriches their faith rather than settling for superficial reading that diminishes their spiritual appetite. He asserts that while some may fear the influence of diverse ideas, it is the lack of depth in reading that poses a greater danger to spiritual growth.