This document discusses understanding Satan and exercising judgment against him. It describes Satan's primary purpose as hardening people's hearts against God and blocking their minds from accepting salvation. It then lists Satan's characteristics, including being sly, a liar, destructive, tempting, and disguising himself as an angel of light. It provides four ways to exercise judgment against Satan: 1) use authority to bind the strong man, 2) live with integrity, 3) watch your words, and 4) cancel all arguments against you. It emphasizes understanding the enemy, using one's authority against demons, and making a decision to live righteously.