On commenting on 2 Corinthians 12:8, John Calvin meditates on Paul not receiving his prayer request.
Here is the August 24 Reading excerpt from the book 365 Days with Calvin: A Unique Collection of 365 Readings from the Writings of John Calvin (356 Days with)
It may seem from this text that Paul has not prayed in faith, for we read everywhere in Scripture that we shall obtain whatever we ask in faith. Paul prays, and does not obtain what he asks for.
I address this problem by saying that as there are different ways of asking, so there are different ways of obtaining. We ask in simple terms for those things for which we have an express promise. For example, we ask for the perfecting of God’s kingdom, the hallowing of his name (Matt. 6:9), the remission of our sins, and everything that is advantageous to us. But when we think that the kingdom of God can, indeed, must be advanced in this particular manner or in that, and what is necessary for the hallowing of his name, we are often mistaken in our opinion.
In like manner, we often commit a serious mistake about asking for what tends to promote our own welfare. We ask for things confidently and without reservation, while we do not have the right to prescribe the means for receiving them. If, however, we specify the means, we always have an implied condition, even though we don’t express it.
Paul was not ignorant about this. Hence, as to the object of his prayer, there can be no doubt that he was heard, though he met with a refusal as to the express form of that answer. By this we are admonished not to give way to despondency in thinking our prayers are lost labor when God does not gratify or comply with our wishes. Rather, we must be satisfied with his grace in not forsaking us. For the reason why God sometimes mercifully refuses to give his own people what in his wrath he grants to the wicked is that he better foresees what is expedient for us than our understanding is able to apprehend.
for meditation: Even with the knowledge that God knows best, it is difficult to submit to his will when our prayers seem to go unanswered. We must pray for the grace to will what God wills and to leave it to his wisdom how he brings his will about. Are you trusting him with all your current concerns?
Calvin, J., & Beeke, J. R. (2008). 365 Days with Calvin: A Unique Collection of 365 Readings from the Writings of John Calvin (356 Days with)(page 255). Leominster; Grand Rapids, MI: Day One Publications; Reformation Heritage Books.