Samuel Logan Brengle emphasizes the importance of spiritual self-sufficiency in his sermon 'Must You Be Fed With a Spoon?'. He draws parallels between the development of children learning to feed themselves and the necessity for Christians to cultivate their own spiritual nourishment rather than relying solely on others. Brengle encourages believers to actively seek and prepare their own soul-food, highlighting that true spiritual maturity involves not only feeding oneself but also being able to feed others. He illustrates this with examples from scripture, such as Aquila and Priscilla, who were able to teach Apollos, and the importance of personal responsibility in spiritual growth. Ultimately, he calls for a community where individuals are empowered to nourish themselves and share their blessings with those in need.