In Conversation with God by Francis Fernandez-Carvajal is a comprehensive 7-volume set presenting brief (5 to 6 page) meditations for every day of the Church's entire liturgical calendar, including feast days and each of the three cycles of Ordinary time on Sundays. The author makes generous use of the writings of the great saints as he brings you focused and moving meditations on themes taken from the Mass Readings for that day, the liturgical season, and more.
This work is rich and extensive enough to serve as your spiritual reading for a lifetime, as it helps you relate the particulars of the message of Christ to the ordinary circumstances of your day. Each volume is small enough for you to carry to Adoration or some other suitable place for meditation.