Just a quick note with a link to a very long read on the topic of prayer: St. Augustine’s Letter 130, “To Proba, a Devoted Handmaid of God.” It is at least a 30 minute read, robust in its treatment of prayer and filled with Scriptural references. You can find the letter online here.
The letter begins as such:
Recollecting your request and my promise, that as soon as time and opportunity should be given by Him to whom we pray, I would write you something on the subject of prayer to God, I feel it my duty now to discharge this debt, and in the love of Christ to minister to the satisfaction of your pious desire. I cannot express in words how greatly I rejoiced because of the request, in which I perceived how great is your solicitude about this supremely important matter.
I think it will take a little “stick-to-it-ness” to follow Augustine’s thought and to absorb all that he offers on the topic of prayer. I also think it will be impossible not to walk away with some “seeds” that will give you fruit for reflection.