12 I think I have spoken long enough, and yet I have not concluded the Gospel lesson: if I go on to declare what remains, I shall burden you, and I fear lest even what has been drawn may be lost; therefore let this be enough for you now, beloved. We are debtors, not now, but always as long as we live; because we live for you. However, do you, by good living, comfort this life of ours, so weak, toilsome, and full of peril in this world; do not afflict and wear us out by your evil manners. For if, when offended with your evil life, we flee from you and separate ourselves from you, and no longer come to you, will you not complain, and say, And if we were sick, you might care for us; and if we were weak, you might have visited us? Behold, we do care for you; behold, we do visit you; but let it not be with us as you have heard from the apostle, “I fear lest I have bestowed labor upon you in vain.”
Source: Tractates on the Gospel of John (New Advent)