Charnock presents a strong biblical case for the absolute necessity of repentance for living the Christian life. Being “born again” means taking on a new life, dead to sin and alive to Christ.

"Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God. Jesus answered, Verily, verily, I say unto thee, Except a man be born of water, and of the Spirit, he cannot enter into the kingdom of God." — John iii. 3,5

These words contain the foundation of all practical religion here, and happiness hereafter. It is the principal doctrine Christ, as a prophet, came to teach, and as a king to work in the heart. It is an answer to Nicodemus his compliment, who came to him with some veneration of him.

Stephen Charnock studied at Emmanuel College, Cambridge, during which he was converted to the Christian faith, beginning his spiritual journey as a Puritan divine. After leaving the college, he possibly held a position as either a private teacher or tutor, then moving on to become a minister of the faith in Southwark for a short time, converting individuals to Christianity. He continued on to New College, Oxford, where he earned a fellowship and gained a position as senior proctor.

He moved to Ireland in 1656 where he became a chaplain to Henry Cromwell, governor of Ireland. In Dublin, he began a regular ministry of preaching to other believers. Those who came to hear him were from different classes of society and differing denominations, and he became widely known for the skill by which he discharged his duties.

Two Sparrows books are layout beautifully with emphasis on typography. Most books have Scriptural index at the end of the book for every verse referenced. The books are designed to look good in day, night and sepia modes and are a joy to read.