Nicene and Post-Nicene Fathers, Ser. II, Vol. XI:
The Works of John Cassian.: Chapter IV. The reason why those who are received in the monastery are not allowed to bring anything in with them.

Chapter IV.

The reason why those who are received in the monastery are not allowed to bring anything in with them.

And for these reasons they do not agree to take from him money to be used even for the p. 220 good of the monastery: First, in case he may be puffed up with arrogance, owing to this offering, and so not deign to put himself on a level with the poorer brethren; and next, lest he fail through this pride of his to stoop to the humility of Christ, and so, when he cannot hold out under the discipline of the monastery, leave it, and afterwards, when he has cooled down, want in a bad spirit to receive and get back—not without loss to the monastery—what he had contributed in the early days of his renunciation, when he was aglow with spiritual fervour. And that this rule should always be kept they have been frequently taught by many instances. For in some monasteries where they are not so careful some who have been received unreservedly have afterwards tried most sacrilegiously to demand a return of that which they had contributed and which had been spent on God’s work.