In Welsh tradition, that is, in the stories, there are three cauldrons.
The first is of dubious nature (and ownership for that matter). It is found in the story of Branwen the Daughter of Llyr in the second book of the Mabinogion. In the story about an arranged marriage that goes bad and the war that results, the Cauldron in question changes hands and its magick brings back to life those dead warriors whose bodies are cast into it (although they no longer retain the capacity for language). It does not surprise me that no hero seems to want to retain ownership of such a relic.
The other two, both of which I find much more appealing, are found in “the Book of Taliesin” and “the Spoils of Annwfn”.
The Cauldron of Cerridwen (also known as the Cauldron of Inspiration or Awen) imparts all knowledge and wisdom and is found in the story of Taliesin. It is a story of initiation and the birth of the Greatest Bard of the Land.
The Cauldron of Annwfn is found in the poem “The Spoils of Annwfn” which recounts an expedition by Arthur (yes, that Arthur) and his men into the Underworld to find what treasures may be discovered there. The Cauldron is in the possession and stewardship of Gwynn ap Nudd, the Lord of the Underworld (and King of the Fae) The description of the Cauldron is beautiful. It is edged with pearls and heated with the breath of nine maidens. But it is the magickal power of the Cauldron that I find most inspirational.
The Cauldron of Annwfn can provide as much of whatever good thing is required however, it will not boil the food of a coward. So, if one is willing to brave the terror of the threshold and the shadows of the Underworld, one can claim as much as one needs of whatever good thing one requires. Courage is all that is needed.
Magick often works that way I think. We must be willing to face what we fear, and in doing so, we gain what we need to live a life of abundance and beauty.