While professor, he decided to dedicate his life to "making the best biblical scholarship available to the average reader". The eventual result was the Daily Study Bible, a set of 17 commentaries on the New Testament, published by Saint Andrew Press, the Church of Scotland's publishing house. Despite the series name, these commentaries do not set a program of regular study. Rather, they go verse by verse through Barclay's own translation of the New Testament, listing and examining every possible interpretation known to Barclay and providing all the background information he considered possibly relevant, all in layman's terms. The commentaries were fully updated with the help of William Barclay's son, Ronnie Barclay, in recent years and they are now known as the New Daily Study Bible series