Your reserves of any supernatural energy you might have, such as mana, psychic energy, chakra, spiritual power, or qi, are now made functionally limitless, being considered constantly, permanently filled to their maximum.
While this doesn't actually increase the size of your reserves directly, this does substantially increase the rate at which they grow indirectly, among other things, by allowing you to use 100% of your power at any and every moment without fear of running dry.