David Wilkerson emphasizes the importance of seeking the hidden truths in Jesus' parables, particularly the parable of the treasure in the field. He explains that the field represents the world where the gospel is preached, and the diligent worker symbolizes those who earnestly seek Christ, discovering that He is the ultimate treasure. The act of selling all to buy the field signifies the need to relinquish self-reliance and worldly distractions in exchange for the life and joy found in Jesus. Wilkerson urges believers to start digging for these treasures today, highlighting the value of a deep, committed relationship with Christ.