Saint John Chrysostom: Second Instruction to Catechumens
I have come to ask first of all for some fruit in return for the words lately said out of brotherly love to you. For we do not speak in order that you should hear simply, but in order that you should remember what has been said, and may afford us evidence of this, by your works. Yea, rather, not us, but, God, who knows the secrets of the heart. On this account indeed instruction is so called, in order that even when we are absent, our discourse may instruct your hearts. And be not surprised if, after an interval of ten days only, we have come asking for fruit from the seed sown. For in one day it is possible at once to let the seed fall, and to accomplish the harvest.