As Galahad's quest and adventure unfold in each image, it appears he is led forth by an angel who is bearing the Holy Vessel. Is this encouragement, a goad to further efforts, such as Galahad's battle against the Seven Knights of Darkness and the sins they represent, and in the process liberating the Maidens representing Virtue? And then there is Galahad's healing of Amfortas, the ailing Fisher King; again the Grail is seen and then borne away once more. Is it the same Angel who guides Galahad in Solomon's ship to Sarras? Again the Grail is in sight, but out of reach until after Galahad is king, and casts off his Crown and regal adornments, which are no longer of any use or worth to Galahad, now having known the source of life and knowledge and power.
It seems obvious Galahad was meant to serve Righteousness along his path to the Grail, guided along much of the way in his endeavors by Angels. The impression is that God meant Galahad, right from birth, to serve the Lord's Purpose with might and steadfastness and virtue.
And apparently I, Sir Launfal, was not entirely worthy of even long beholding the illustrations of Galahad's glorious conquest, as I was escorted from the room by a keeper of the library after only a quarter of an hour (I was informed that the room was sealed off for a dinner function, and that I was not allowed in there).