Perception of Pleasure Is Dependent on the Desire for Pleasure
The most important determinant of the perception of pleasure is the thirst for pleasure, which in Kabbalah is known as a “vessel.” The size of the vessel is determined by the degree to which one feels the need for the lack of pleasure.
For this reason, if two separate vessel-people receive the same pleasure, one will receive a feeling of absolute satiation, while the other will feel no sense of possessing anything and, thus, be very depressed.