We can appreciate the reason for praying with one’s whole self, body and soul, when we understand what it means to be a human being. A human person is not essentially a disembodied soul that happens to be housed for a short span of years in a mortal body that someday will be sloughed off. A living human person is a body-spirit unity, a body enlivened by spirit and a spirit incarnate in flesh. I cannot say that I am essentially my body or that I am essentially my spirit. I am at the same time an embodied spirit and an inspired body. As believers in the immortality of the soul and the resurrection of the body, we understand that body and soul belong together.
Charles Cummings, Monastic Practices, 2nd ed. (Collegeville, MN: Liturgical Press, 2015), p. 10. ISBN: 978-0-87907-484-5. (Emphasis added)