John Nelson Darby emphasizes the necessity of self-knowledge and communion with God, illustrating how God leads His people through trials to reveal their hearts and draw them closer to Him. He reflects on the importance of being in tune with God's heart, as true rest and satisfaction can only be found in Him, not in the world. Darby encourages believers to allow God to search their hearts and to recognize their dependence on Him, highlighting that self-judgment leads to joy in God. He reminds us that through God's love and discipline, we can achieve a deeper understanding of ourselves and a more profound relationship with Him. Ultimately, the sermon calls for a heart fully surrendered to God, fostering peace and fellowship with Him.

Chuck Smith explores the profound theme of self-knowledge through Psalms 139, emphasizing God's intimate knowledge of our lives, from our thoughts to our actions. He highlights the struggle of understanding our true selves, as our hearts can be deceitful and we often shield ourselves from painful truths. Smith encourages believers to submit to God's guidance, recognizing that pride can hinder our willingness to seek help and direction. Ultimately, he calls for a humble acceptance of God's leading in our lives, urging us to trust in His presence and wisdom.