I understand man to be a trinity, in that man functions on three levels. Spirit, soul, and body. The body, functions and operates in relation to the material and natural world, for example, ‘sight,’ ‘smell,’ ‘hearing,’ ‘taste’ and ‘touch.’ The soul consists of the mind (imagination, memory are of the mind), will, and emotion. It the apsect of you that is self-aware and personal. The spirit of man is that which in touch with the spiritual realm, whether being alive to God or the demonic. I have heard the heart described as being the bridge between the soul and spirit, being the core of man.
This understanding seems to have its source in current theological writings and sermons heard in church. There is nothing in the Bible which teaches this trichotomy.
And I will say to my soul, Soul, you have ample goods laid up for many years; take your ease, eat, drink, be merry.’ Luke 12:19
The context of this verse is the parable our Lord gave concerning the man who was planning to lay up for his old age but died that very night. The man was talking to his "soul". Was he talking to his mind, will, and emotions? And who was doing the talking? His spirit? But that's the part that is supposed to be dealing with the spiritual realm, not the part that makes plans for a comfortable future.
The primary meaning of the Greek word "psuchā" is not "the mind, will, and emotions." It is "self". The man in the parable was talking to his "self", or, as we would say today, he was "talking to himself."
I was going to refer you to a post I made in "Misc.Theological Topics" on Dec 11, 2006, but I cannot seem to find it any more. However, I saved it, and here is a reposting:
THE BIBLICAL MEANING OF “SOUL”
In both New and Old Testaments, I find that there are basically four meanings of the word translated as "soul" (that is, the Greek word "psuchā" and the Hebrew word "nephesh.") Here are a few examples:
New Testament
LIFE
Mark 8:35
For whoever would save his soul will lose it; and whoever loses his soul for my sake and the gospel’s will save it.
BEING
Matt 20:27,28
and whoever would be first among you must be your slave; even as the Son of man came not to be served but to serve, and to give his soul as a means of liberation in place of many.
Matt 26:38
Then he said to them, "My soul is very sorrowful, even to death; remain here, and watch with me."
SELF
Matt 6:25
"Therefore I tell you, do not be anxious about your soul, what you shall eat or what you shall drink, nor about your body, what you shall put on. Is not the soul more than food, and the body more than clothing?
Luke 12:19
And I will say to my soul, Soul, you have ample goods laid up for many years; take your ease, eat, drink, be merry.’
Matt 12:18
(Quoting Isaiah)
"Behold, my servant whom I have chosen, my beloved with whom my soul is well pleased. I will put my Spirit upon him, and he shall proclaim justice to the Gentiles.
Luke 14:26
"If any one comes to me and does not discount his own father and mother and wife and children and brothers and sisters, yes, and even his own soul, he cannot be my disciple.
Sometimes there is a fine line, or perhaps even no line, between the meaning "being" and the meaning "self."
PERSON
Acts 3:23
[Quoting Moses]:
And it shall be that every soul that does not listen to that prophet shall be destroyed from the people.
Acts 2:41
So those who received his word were baptized, and there were added that day about three thousand souls.
Old Testament
BEING
Gen 2:7
then the Yahweh God formed man of dust from the ground, and breathed into his nostrils the breath of life; and man became a living soul.
LIFE
Gen 1:20
swarms of creatures that have soul.
Leviticus 17:11 ‘For the soul of the flesh is in the blood …
SELF
Genesis 27:4 and prepare a savory dish for me such as I love, and bring it to me that I may eat, so that my soul may bless you before I die."
Leviticus 19:28 You shall not make any gashes in your flesh for the soul or tattoo any marks upon you: I am Yahweh.
PERSON
Leviticus 21:1 Yahweh said to Moses: Speak to the priests, the sons of Aaron, and say to them: No one shall defile himself for a dead soul among his relatives.
In this last one "nepesh" is usually translated as "body". If "nepesh" means both "body" as well as what we think of as "soul" then how can we distinguish between the two?
I think of the human being (or human "soul") as a unified being. The terms "body", "soul", and "spirit" are simply different aspects of that holistic being.