The story of Achan in Joshua 7:20-26 illustrates significant lessons about sin, greed, and consequences, emphasizing that the spoils of victory belong to God and that sin can harm not only the sinner but also others and the community. Achan's greed led to his punishment and the death of 36 men, highlighting that sin in the church cannot be tolerated. Ultimately, the document stresses that confession alone does not absolve one from the repercussions of sin, which must be repented to maintain holiness within the congregation.