Antony Flew 
Hume”s Philosophy of Belief (Routledge Revivals) [PDF ebook] 
A Study of His First 'Inquiry’

First published in 1961, this book considers Hume’s request to be judged solely by the acknowledged works of his maturity. It focuses on Hume’s first Inquiry in its own right as a separate book to the likes of his other works, such as the Treatise and the Dialogues, which are here only used as supplementary evidence when necessary. This approach brings out, as Hume himself quite explicitly wished to do, the important bearing of his more technical philosophy on matters of religion and of world-outlook generally: 'Be a philosopher; but amidst all your philosophy, be still a man.’