Ash Wednesday will be here very soon, on March 5, and we will be in Lent. It is a good time to take stock of where we are spiritually, but a better time to go deeper spiritually. The Catholic Church provides many ways for us to do that: fasting, abstinence from meat, Mass on Ash Wednesday, and so on. You are very much encouraged to come to daily Mass. Schedules do not always allow for that, though, so perhaps a book of short meditations that you could pick up at the end of a busy day would be helpful. Here are some recommended books. The Aquinas can be read online free of charge. The others are available various formats including Kindle.
Meditations for Lent, by Jacques-Bénigne Bossuet
Roman Pilgrimage: The Station Churches, by George Weigel
At the Foot of the Cross – Gerald Vann, an English Dominican
7 lessons of Mary for the Sorrowing Heart
The Seven Last Words of Jesus by Romanus Cessario, OP