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"When we go to Holy Communion, all of us receive the same Lord Jesus, but not all receive the same grace nor are the same effects produced in all. This comes from our greater or lesser disposition. To explain this fact, I will take an example from nature. Consider the process of grafting, the more similar the one plant is to the other, the better the graft will succeed. Likewise, the more resemblance there is between the one that goes to Communion and Jesus, so much the better will the fruits of Holy Communion be."
(St. Anthony Mary Claret, as quoted by Stefano M. Manelli in Jesus Our Eucharistic Lord)