The structure of sorrow works through comparison, this time is compared to some better time (past of future), this (worse) situation is compared to that (better situation).The transmitter in the mechanism is thought.

The mechanism of comparison can be useful functionally, at work, in science, to build a bridge. Psychologically however, it's a factor of degeneration.

One is having a meal and is thinking of the 'better' meal he had yesterday. But it's because one does not perceive what is happening, the colours, the tastes, the thoughts, the sounds, the weight, all together at the same time, now. It is the only Meal we have, this one always now, forever infinitely extraordinarily new and special. The changing objects are of less importance. What is most important is the quality of perception, Unitary Perception.