The Rule of St. Benedict

Let it not be allowed at all for a monk to give or to receive letters, tokens, or gifts of any kind, either from parents or any other person, nor from each other, without the permission of the Abbot. But even if anything is sent him by his parents, let him not presume to accept it before it hath been make known to the Abbot. And if he order it to be accepted, let it be in the Abbot's power to give it to whom he pleaseth. And let not the brother to whom perchance it was sent, become sad, that "no chance be given to the devil" (Eph 4:27; 1 Tm 5:14). But whosoever shall presume to act otherwise, let him fall under the discipline of the Rule.