The greatest difficulty after conversion is to keep the heart with God. Direction and help in this great work are the scope of the text wherein we have: An exhortation: Keep thy heart with all diligence.
This work is a collection of 42 of Flavel's sermons on the person and work of Christ. Being a puritan, the work Flavel displays here is well thought out but presented in a way that will require some reflection from the reader.
In his comprehensive and helpful book Flavel looks at what 'Keeping the Heart' means, why we should take commission seriously and particular times when we need to be especially wary of being distacted from our goal.