J.R. Miller emphasizes the importance of knowing when to speak and when to remain silent, drawing from Ecclesiastes 3:7. He highlights that while speech can be powerful and beneficial, there are moments when silence is more appropriate and even necessary, especially in the presence of grief or injustice. Miller reflects on the example of Jesus, who often chose silence over words, teaching us that self-discipline and divine help are essential in mastering our speech. He warns against the dangers of hasty words that can cause irreparable harm and encourages believers to seek God's guidance in their communication. Ultimately, the sermon calls for a balance between speaking and silence, urging us to listen for God's voice before we speak.