Purchased last month on amazon for £11 ; The origin of Pauls Religion (james sprunt lectures delivered at union theological seminary in virginia) by J Gresham Machen is a valuable weapon against the heresies of the New perspectives on Paul which is rife in the church today. Originally published in 1921 , it has now been re-printed (digitally remastered) by Forgotten Books :: 484,473 Free Books, World's Largest Online eBook Library in 2012 . A must buy for serious students and layfolk alike