The Bible contains hundreds of passages that mention angels. These creatures play an integral part in the Scriptures - some acting as ministers to carry out God's plan, others aligning with the Devil to carry out his wicked schemes against God and man. Though not an exhaustive study, this book serves as an introduction to the topic of angels, including their origin, destiny, and work. It considers the difference between angels and demons, and discusses the popular concept of "guardian angels." This material also contains a related study on the origin of Satan. The reader is invited to examine this topic with an open mind and test everything by what the Bible teaches. By doing so, we can be sure that this will be a profitable study. Let us now consider what the Bible teaches about angels.