https://www.mljtrust.org/sermons-online/ephesians-6-10-13/discouragement/

The devil uses multiple tactics in order to discourage God’s people from being useful for kingdom work. In this sermon on Ephesians 6:10–13 titled “Discouragement,” Dr. Martyn Lloyd-Jones discusses how discouragement cripples the life of the Christian and how God has equipped His people to fight against this attack in His word. Dr. Lloyd-Jones addresses the difference between self-evaluation and introspection, which is looking to oneself for their worth and value. Dr. Lloyd-Jones combats this by stating that what makes a person a Christian is not anything that they will find within, but simply through the blood of the Savior. Christian assurance can never come from oneself; this will only breed discouragement. The Christian must instead combat their own doubts and discouragement with thankfulness over what Christ has already accomplished. This is a truth that should demand action from the Christian, saturating every aspect of their life and ministry. Listen as Dr. Lloyd-Jones presents the hope that can be found in the midst of a discouraging world and the friend the Christian has in Jesus; a friend who is no stranger to the hurdles Christian’s face.