In this book Heaven on Earth, Thomas Brooks wrote,

A man may be a true believer, and yet would give all the world, were it in his power, to know that he is a believer. To have grace, and to be sure that we have grace is heaven on this side of heaven.

James Fraser endured a long conflict with doubts. This little book, taken from his memoirs (Memoirs of the Rev. James Fraser of Brea, found in Scottish Puritans: Select Biographies, volume two), is a helpful record of how he overcame his fears, and arrived at a firm assurance of his salvation in Christ.

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THE POCKET PURITAN SERIES:
To read the work of a Puritan doctor of the soul is to enter a rich world of spiritual theology to feed the mind, heart-searching analysis to probe the conscience, Christ-centred grace to transform the heart, and wise counsel to direct the life. This series of Pocket Puritans provides all this in miniature, but also in abundance."
- Dr. Sinclair B. Ferguson