And it is here within his conception of moral practice as desire-discovery—or as he calls it, “practical wisdom”—that for Thomas a principal means of tracing the way back to what we really want, is prayer, oratio. And our only available starting point for that practice of self-discovery is our wants and desires as we actually experience them. Therefore, Thomas says, we ought to pray for what we think we want regardless. For prayer is “in a certain manner a hermeneutic of the human will,” so that by way of placing our desires as we experience them before God we are asking also that those desires be “unfolded,” “explicated,” thereby to release their real significance, the real want that is wrapped up in, “implicated” in all their opacity in their form as experienced. Therefore, says Thomas, we ought to pray, as Jesus did in the garden of Gethsemane, “in response to our animal desire” (secundum sensualitatem). For when we pray as Jesus did then, out of animal need and desire—for Jesus was scared of death, as naturally any animal is—we are placing that animal need and desire within the interpretative power of the divine will itself, wherein alone we will discover our own real will. Therefore, Thomas concludes, we ought always to pray for what we think we want; for Jesus prayed as he did in Gethsemane so as to teach us just that lesson, namely that it is “permitted for human beings naturally to desire even what [they know] is not God’s will”; and, as if in reinforcement of what for many is a startling thought, he cites the authority of Augustine to the same effect, commenting on the same prayer of Jesus: “It is as if [Jesus] were saying: ‘See yourself in me: for you [too] can wish something for yourself even though God wishes something else.’” Only thus, in the prayer of honest desire, is there any chance of our discovering what are our true desires, our real will.
–Denys Turner; via