There is a discernment of “the next world,” and there is a discernment of “this world.” The next world is considered “faith,” and this world is considered “attainment.”
It is written about the next world, “they shall eat and they shall delight,” meaning that there is no end to the satiation. This is so because everything that is received by faith has no limits. However, what is received through attainment already has limits, since everything that comes in the Kelim of the lower one, the lower one limits it. Hence, there is a limit to the discernment of this world.