Though the focus of Sinsinawa Dominican Vision this month is preaching, I am not going to recommend books about pulpit preaching. Edward Schillebeeckx once said, Contemplation is preliminary to the preaching.
Contemplation is also necessary for, as well as preliminary to, a preaching heart.
The three books I wish to call to your attention focus on the Gospel values of compassion, respect for creation, and seeking and discovering the truth. Buddhist Arts of Compassion by Pamela Bloom, ed. Jesus is named by Monica Hellwig, and perhaps by others, the compassion of God. It is said that there is a statue in Vietnam of Jesus and Buddha seated together with their arms around one anothers shoulders. It is stories rather than theories that awaken our compassionate nature, for example the parables and healings in the Gospels.