6 I remember that you proposed when we parted that the brethren at Thagaste should hold me responsible to make up the half of the sum claimed; let me say in conclusion, that as I fear everything which may make my attempt unsuccessful, if you clearly perceive that proposal to be a just one, I do not refuse to comply with it on this condition, however, that I am to pay the amount only when I have it in my power, i.e. when something so considerable falls to our monastery at Hippo that this can be done without unduly straitening us—the amount remaining after the subtraction of so large a sum being still such as to provide for our monastery here an equal share in proportion to the number of resident brethren.
Source: Letters (New Advent)