Every serious student of the Bible desires to understand the text, discover the biblical principles, and apply the truths to his/her life. This commentary is designed to help students, pastors, and Bible teachers understand First and Second Thessalonians in a simple manner. Working from the popular New International Version (NIV), the author provides helpful commentary on the text verse by verse. This verse-by-verse commentary is different from others in two respects. First, it is brief while some commentaries are unnecessarily wordy and verbose. Second, it is Pentecostal in outlook. This implies that we generally adhere to the doctrine of biblical inerrancy and adopt a literalist approach to the interpretation of the Bible. The major aim of this commentary is to expose readers to First and Second Thessalonians. It is written primarily for the busy pastor, Sunday school teacher, or Christian leader who desires to better understand Paul's message to the Thessalonians. First Thessalonians encourages believers to endure persecution, while Second Thessalonians corrects a wrong understanding of the "day of the Lord." These epistles were designed to help the church in Thessalonica face suffering in a Christ-centered manner, and they can do the same for believers today.