A.W. Pink's sermon 'Tried by Fire' explores Job's journey through suffering and his ultimate faith in God's omniscience and purpose. Job initially expresses bitterness over his trials but quickly corrects himself, finding comfort in the knowledge that God knows his path and will refine him through testing. Pink emphasizes that divine testing is a necessary part of the Christian experience, leading to spiritual growth and eventual glory. He reassures believers that, despite their struggles, they will emerge from trials as refined gold, reflecting God's image. The sermon encourages Christians to trust in God's plan and to view their afflictions as opportunities for growth and deeper faith.