In this excellent book of advice and teaching for Christian believers, W. P. Mackay discusses a range of topics surrounding God and the spiritual life. This guide contains a range of profound lessons reminding us of the nature of the holy spirit, and the deeds all good Christians must carry out in life. Much of the book is composed as a conversation between two believers; this lively style ensures readers can stay engaged and understand better the teaching offered. The author frequently quotes Biblical scripture, that readers are assured of the truth and correctness of this book's words. We are reminded that the forgiveness of sins is not a matter of simply asking God; living a virtuous life mindful of one's forgiven soul is how great Christians can proceed in authentic faith. The differences between true service of the Lord, and service performed without truth in the heart, is discussed. We are also offered cautionary lessons, informing us of the dangers of the Devil. The author had ample experience with faith; having lost all belief in the divine at a young age, he qualified as a medical doctor, publicly renounced God and even became President of his local Atheist society. However after observing the enormous positive effect of belief upon his patients' health, he dramatically changed his outlook on life and returned to the Christian fold. Born again, W. P. Mackay went on to become a Presbyterian minister and a popular author.