Paul Washer preaches from 1 John about Assurance of salvation in Jesus Christ alone. A true Christian looks only to Christ with regard to salvation, not in anything with himself. The book of John is written so that people may read this book and believe. 1 John 5,13 - "This is written to you so that you may know that you have eternal life." The assurance comes from the Word of God, and The Holy Spirit will give assurance based on the Word of God.