The Imitation of Christ by Thomas à Kempis is a classic Catholic book and the second most widely-read spiritual book after the Bible. It has been a guide and inspiration for saints, popes, and laity since the 15th century through present day. Kempis provides profound reflections and direction on how to form our interior selves and our lives in imitation of Christ who is the Way, the Truth and the Life.
 
The Imitation of Christ is a wonderful book to read as a devotional especially during Lent and Advent. It's also a perfect Confirmation gift or for a new Catholic that will be used for a lifetime.