A.B. Simpson emphasizes that true joy is a choice made through faith rather than a mere feeling. He encourages believers to rise above their struggles and choose to praise God, even in the face of adversity, as illustrated in scriptures like Philippians 4:4 and James 1:2. Simpson highlights that joy often comes after a struggle with sadness, and that offering praise can be a significant sacrifice, especially when one is burdened by grudges or self-pity. By consciously deciding to rejoice in the Lord, believers can break free from the chains of negativity and embrace a life of joy. This act of faith leads to a deeper relationship with God and a more fulfilling spiritual life.