For indeed the school of the Church is an admirable surgery — a surgery, not for bodies, but for souls. For it is spiritual, and sets right, not fleshly wounds, but errors of the mind, and of these errors and wounds the medicine is the word.
This medicine is compounded, not from the herbs growing on the earth, but from the words proceeding from heaven — this no hands of physicians, but tongues of preachers have dispensed. On this account it lasts right through; and neither is its virtue impaired by length of time, nor defeated by any strength of diseases. For certainly the medicines of physicians have both these defects; for while they are fresh they display their proper strength, but when much time has passed; just as those bodies which have grown old; they become weaker; and often too the difficult character of maladies is wont to baffle them; since they are but human.
Whereas the divine medicine is not such as this; but after much time has intervened, it still retains all its inherent virtue. Ever since at least Moses was born (for from thence dates the beginning of the Scripture) it has healed so many human beings; and not only has it not lost its proper power, but neither has any disease ever yet overcome it. This medicine it is not possible to get by payment of silver; but he who has displayed sincerity of purpose and disposition goes his way having it all.
On account of this both rich and poor alike obtain the benefit of this healing process. For where there is a necessity to pay down money the man of large means indeed shares the benefit; but the poor man often has to go away deprived of the gain, since his income does not suffice him for the making up of the medicine. But in this case, since it is not possible to pay down silver coin, but it is needful to display faith and a good purpose, he who has paid down these with forwardness of mind, this is he who most reaps the advantage; since indeed these are the price paid for the medicinal treatment.
And the rich and the poor man share the benefit alike; or rather it is not alike that they share the benefit, but often the poor man goes away in the enjoyment of more. What ever can be the reason? It is because the rich man, possessed beforehand by many thoughts, having the pride and puffed-up temper belonging to wealthiness; living with carelessness and lazy ease as companions, receives the medicine of the hearing of the Scriptures not with much attention, nor with much earnestness; but the poor man, far removed from delicate living and gluttony and indolence; spending all his time in handicraft and honest labours; and gathering hence much love of wisdom for the soul; becomes thereby more attentive and free from slackness, and is wont to give his mind with more accurate care to all that is said: whence also, inasmuch as the price he has paid is higher, the benefit which he departs having reaped is greater.
St. John Chrysostom, "Homily Against Publishing the Errors of the Brethren"