Book Recommendation- Thinking Spiritually by John Owen (abridgement in easy English).

I cannot recommend this book highly enough. It can either be read as a devotion is 21 small parts, or like I did, read straight through. I have instructed my wife to read it as a devotion with our children, and I expect to read it many times over.
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John Owen (1616-1683) is one of the most prominent theologians England has ever had. The Grace and Duty of being Spiritually Minded was published in 1681, after illness had caused Owen to spend time meditating upon the importance of spirituality.

'Of all the evils which I have seen in the days of my pilgrimage', he wrote, 'there is none as grievous as the public contempt of the principal mysteries of the Gospel among them that are called Christians.'

Thinking Spiritually is an abridgement of Owen's volume, in easier English.

Some gems from the book:

"Another mark of true Spiritual renewal as compared with mere moral reformation is that the former will love all spiritual things without exception. No selection will be made to love some things of God and not others, or to obey some of the Lord's commands and not others. Where there is ignorance of something that requires, the person truly renewed will at once receive it when shown it from the Scripture"-Thinking Spiritually by John Owen. p66

Note: Just to clarify, by 'spiritual things' Owen is referring to 'Biblical doctrine' and not charismatic spiritual gifts; and "true Spiritual renewal" is the saved person as opposed to the non-regenerate with "mere moral reformation".

"...People often deceive themselves about the seriousness of such decays. They persuade themselves that they are only under the influence of one sin, while being diligent in all other religious matters. But one sin willingly enjoyed will destroy the soul as much as a thousand (James 2:10-11). In any case there are no people who are able to limit themselves to only one sin.
It is also a false pretense to suppose that you can truly love God while preserving one sin in your life (1 John 2:15). Where God is not loved above all, He is not loved at all. It is equally wrong to suppose that though we may permit ourselves to sin now, we will stop later on. Whoever refuses to avoid all sin now, never truly intends to avoid it and probably never will." ibid p77-78