They have no door to their house

Some brothers were coming from Scetis to see Abba Anthony. When they were getting into a boat to go there, they found an old man who also wanted to go there. The brothers did not know him. They sat in the boat, occupied by turns with the words of the Fathers, Scripture and their manual work. As for the old man, he remained silent. When they arrived on shore they found that the old man was going to the cell of Abba Anthony too. When they reached the place, Anthony said to them, "You found this old man a good companion for the journey?" Then he said to the old man, " You have brought many good brethren with you, father." The old man said, "No doubt they are good, but they do not have a door to their house and anyone who wishes can enter the stable and loose the ass." He meant that the brethren said whatever came into their mouths. - 18th saying of St. Anthony