In his sermon "Hold Fast Until the End, the Beginning of Our Assurance," Pastor Brian examines Hebrews 3, warning against the danger of unbelief and hardened hearts. Drawing parallels between the Israelites who forgot God's blessings in the wilderness and our own tendency to grumble despite God's provision, he presents three keys to maintaining faith: believing when it makes no sense, encouraging one another daily, and keeping our testimony fresh by sharing what Christ has done in our lives.