I describe the essence as what it perceives, so that everything that changes does, except the fact that we perceive that it changes. We can say that someone is quiet or not, depending on the circumstances, but we will always say that someone is himself. That something is what we are, and what makes us the same today as the day we were born.

With the term essence I don't mean something material but something immaterial that perceives changes in matter, mood, and other sensations and feelings, since what it feels, that is, what it perceives, is always the same, an I don't know what to which we give the name of soul.

Maybe in Buddhism have something similar when they talk about rebirth or reincarnation and liberation. Because for something to be reborn, it must have been born before, and although it changes and becomes different, it still is. In the same way that for something to be liberated it must first have been in another state (slavery), but remain the same thing.

What philosophers and religious call it soul, psychologists give it the name of psyche, and that is what makes the human function as a unit, because in effect, that is one of the main qualities of the soul, that of being one.

I also appreciate having quality talks, and as for me, the discussion could be extended indefinitely. :)