If asked 'What should I read for spiritual formation, to help me to think with the Church,' there are many books one could recommend. The Bible, of course, but even there it helps to have some direction beyond the readings given for daily Mass.
In a recent general audience, Pope Benedict XVI remarked: “I would like to renew my call to everyone to pray the Psalms, to become accustomed to using the Liturgy of the Hours: Lauds, Vespers, and Compline.”
The Liturgy of the Hours has designated readings for each day and for every special day in the liturgical calendar. It also includes various hymns and even an appendix of poetry.
For example, for this Thursday in the 4th week of Ordinary Time, the office of readings include 2 Thessalonians 1:1-12 and an extract from the Catecheses of St Cyril of Jerusalem. The readings in the monthly cycle of the Hours include:
Psalm 44, 143:1-11, 147:1-11, 128, 129, and 144 as well as Isaiah 66:10-14, Romans 8:18-21, 1 John 3:23-24, Wisdom 1:1-2, Hebrews 12:1-2, Revelation 11:17-18, 12:10-12 and various hymns, prayers and intercessions.
However, since this Thursday falls on February 2th, the feast of the Presentation of Our Lord, there are also special readings: Psalms 2, 19A, 45; Exodus 13:1-3, 11-16 and a sermon by Saint Sophronius about being receptive to the Eternal Light. Additional readings for the Hours (for example, for Morning Prayer [also called Lauds] and Evening Prayer [also called Vespers]) include readings from Isaiah, Psalms, Colossians as well as various prayers, hymns, and intersessions.