This classic work by the Puritan John Flavel was written to convince believers of the need to guard their hearts at all times and to help them fulfill this duty in a biblical way. The author explains what it means to guard the heart and then proceeds to detail those times in the Christian life when the heart requires special care. He includes pastoral advice for twelve important periods of the Christian life, including times of prosperity, adversity, danger, need, and temptation. For these times, and others that may come, the author offers words of encouragement, exhortation, and guidance that are relevant for Christians of any era. Taking them seriously will help the believer cultivate their love for God and protect it from diminishing, no matter the circumstance in which they are striving to offer a pleasing service to God.