The artwork I was thinking of was the Ecstasy of Teresa of Avila, a 16th century Spanish saint. Leave it to an Italian artist and a Spanish saint to make prayer look like that! It figures that Unamuno scatters fairly approving references to St. Teresa throughout The Tragic Sense:
And Teresa herself? She wrote things like this:
I saw an angel close by me, on my left side in bodily form. This I am not accustomed to see unless very rarely. Though I have visions of angels frequently, yet I see them only by an intellectual vision, such as I have spoken of before. It was our Lord’s will that in this vision I should see the angel in this wise. He was not large, but small of stature, and most beautiful – his face burning, as if he were one of the highest angels, who seem to be all of fire: they must be those whom we call Cherubim�I saw in his hand a long spear of gold, and at the iron’s point there seemed to be a little fire. He appeared to me to be thrusting it at times into my heart and to pierce my very entrails; when he drew it out, he seemed to draw them out also and to leave me all on fire with a great love of God. The pain was so great that it made me moan; and yet so surpassing was the sweetness of this excessive pain that I could not wish to be rid of it. The soul is satisfied now with nothing less than God. The pain is not bodily, but spiritual; though the body has its share in it, even a large one. It is a caressing of love so sweet which now takes place between the soul and God, that I pray God of his goodness to make him experience it who may think that I am lying.
I… just don’t know what to make of that… but it’s got the love and suffering thing happening, certainly!