The mindfulness phenomenon is rampant in schools, hospitals, businesses, convents and parishes. Faced with its spread in ecclesial settings as well, Fr. Iacopo Iadarola questioned whether it is appropriate to integrate this meditative practice of Buddhist origin into Christian life and prayer. In the proliferation of enthusiastic, sometimes superficial publications about mindfulness, this study, which makes use of a rich bibliography from countries where it has already been widespread for decades, stands, at least in Italy, as the only survey that highlights the problematic issues of an uncritical reception. This is done without falling into a deaf apologetic but anchoring itself in the magisterium and Buddhist sources, and making use of observations by psychologists, sociologists and those same exponents of Buddhism who warn against the spiritual consumerism into which mindfulness would seem to be slipping (abroad they are beginning to speak of McMindfulness!). A substantial contribution in the afterword by Father Antonio Gentili, a leading and most open-minded exponent in the dialogue between Christianity and the East, supports the author’s work of discernment in the search for a delicate balance between unconditional rejection and naive acceptance.