Recalling God’s faithfulness and control over everything that touches us gives us strength to walk with God even when we feel like giving up in despair.  After all, our feelings and circumstances have not changed God.  He is perfectly capable of sustaining us if we will only let Him.  We simply need to choose to delight in and diligently consider God’s precepts (His principles and character) despite how we feel.  Choosing to delight in God might not be easy.  It might even involve hard work.  But only God can revive and save our soul from spiritual lethargy.