Read the most widely-read devotional book next to the Bible 'At the Day of Judgment we shall not be asked what we have read but what we have done.' - Thomas à Kempis, The Imitation of Christ The Imitation of Christ by Thomas à Kempis is a classic Catholic devotional book. Essential reading for all Christians, The Imitation of Christ encourages Christians to remain faithful to God and cultivate inward peace, purity of heart and a good conscience while being thankful for every gift from God.