Nicene and Post-Nicene Fathers, Ser. II, Vol. XI:
The Works of John Cassian.: Chapter XXI. That although we acknowledge that we cannot be without sin, yet still we ought not to suspend ourselves from the Lord's Communion.

Chapter XXI.

That although we acknowledge that we cannot be without sin, yet still we ought not to suspend ourselves from the Lord’s Communion.

Yet we ought not to suspend ourselves from the Lord’s Communion because we confess ourselves sinners, but should more and more eagerly hasten to it for the healing of our soul, and purifying of our spirit, and seek the rather a remedy for our wounds with humility of mind and faith, as considering ourselves unworthy to receive so great grace. Otherwise we cannot worthily receive the Communion even once a year, as some do, who live in monasteries and so regard the dignity and holiness and value of the heavenly sacraments, as to think that none but saints and spotless persons should venture to receive them, and not rather that they would make us saints and pure by taking them. And these thereby fall into greater presumption and arrogance than what they seem to themselves to avoid, because at the time when they do receive them, they consider that they are worthy to receive them. But it is much better to receive them every Sunday for the healing of our infirmities, with that humility of heart, whereby we believe and confess that we can never touch those holy mysteries worthily, than to be puffed up by a foolish persuasion of heart, and believe that at the year’s end we are worthy to receive them. Wherefore that we may be able to grasp this and hold it fruitfully, let us the more earnestly implore the Lord’s mercy to help us to perform this, which is learnt not like other human arts, by some previous verbal explanation, but rather by experience and action leading the way; and which also unless it is often considered and hammered out in the Conferences of spiritual persons, and anxiously sifted by daily experience and trial of it, will either become obsolete through carelessness or perish by idle forgetfulness.