When you are weary of praying, and do not receive, consider how often you have heard a poor man calling upon you, and have not listened to him, and he has not been angry nor insulted you.
[St. John Chrysostom, Homily XI on First Thessalonians]
Make God your debtor, and then offer your prayers. Lend to Him, and then ask a return, and you shall receive it with usury. God wills this, and does not retract. If you ask with alms, He holds himself obliged. If you ask with alms, you lend and receive interest.
Yes, I beseech you! It is not for stretching out your hands you shall be heard! stretch forth your hands, not to heaven, but to the poor. If you stretch forth your hand to the hands of the poor, you have reached the very summit of heaven. For He who sits there receives your alms. But if you lift them up without a gift, you gain nothing.
[St. John Chrysostom, Homily I on Timothy]