Prologue to The Rule (paragraph 7)
We must, therefore, prepare our hearts and bodies to serve him under the guidance of holy obedience. Conscious in this undertaking of our own weakness let us ask the Lord to give us through grace the help we need. (From para. 7 of Prologue to The Rule of Saint Benedict's Rule, trans. by Patrick Barry, OSB, 1997.)
When I reflect on what it means to me to "prepare my heart and body", I realize I'm called to a clearing out of attachments. I once heard that, "attachments can cause distorted thinking". The mantra helps me to be free.