I bought both Vol. 1 and Vol.2 of these Barclay study books in order to have coverage of the whole of the gospel of John. For me they were going to provide background knowledge and a commentary for a series of sermons based on John's Gospel. Their detail, reliability and practicality are perfect. They are designed for use as an undated daily Bible reading/study resource, but they work every bit as well simply as a commentary. William Barclay needs no introduction; he is a well known Bible scholar, writer and preacher with many grateful readers. The series covers the whole of the New Testament should they be wanted. These are excellent books and I recommend them.