You say, "...in that I mean there isn't any empirical evidence that either one of them exists..." refering to soul and spirit.

If you looked up definition of soul and personality I think you would find them rather synonymous.

Soul I think being an elder word that could easily be traded with personality in most context. I understand, as you might find, has apart of soul's definition, and/or with connotations, that the soul of an individual is considered immortal.

If we discussed in terms of personality, each person has a unique individual personality that we might not say is immortal and lives for ever, but in simular context we might could reasonably say that no other personality would ever be exactly like anyone else ever.

So It seems to me that if you have empirical evidence for personality then you have empirical evidence for everything about the fact of a soul existing, just not evidenced to last for ever in immortality.

As to spirit, consider the use of spirit in sports terms like people have "team spirit ". Spirit in a person could easily be replaced with the word motivation. If a person has motivation they have something in their thoughts that gives them the force or power to do things. The connection of Soul and spirit as well as personality and motivation could be discussed in simular ways.

I do not think there is a lacking for empirical evidence of soul and spirit but rather a lacking of an understanding as to what they are.

@Word I understand where you're coming from, so, can it be also said that the soul is related to consciousness, self-awareness, and spirit related to the bioelectrical energy that keeps us alive?
This would be more empirical evidence of their existence and the words themselves are just a matter of self-interpretation which are of course subjective to the individual.
However, as to the matter of either being immortal and carries on after the death of the body remains to be seen and would require more of an empirical investigation.

Thank U - most sincerely - for taking the time and as many have attested - the effort - to read the entire post - and for responding & critiquing in such gracious manner -

I can appreciate your apprehension in such distinction between - Soul & Spirit -
IMHO - both U and Word: - have percieved - analyze & concluded - correctly -
regarding such definitions and differentiation -

as to empirical evidence - of such - Aspects of Ones Self -
to Me - there is No better such - evidence - than that -
which One is - Personally - able to - experience -
& thus Know - it to be - True - experientially -

as such look within to find that which is - TRUE for U -
for it is in Ones own LIFE experiences that- One "feels" -
recognizes & acknowledges such Aspects of - Ones Self -

for - ALL humans - have "felt" an - Emotion -
and LOVE is such ENERGY in motion - in as thru -
Beings of LIFE - such as - Ones Self -

will U as a - Person - that has experienced such - Emotion -
allow another to determine the "reality" of - Your - experience -
or will Your TRUTH as U have thus experienced it - Be Your Truth -
for me and most other humans the latter is the Truth - of My reality -

thus R U & I - able to - percieve - cognize - realize - Ones Soul -
thus R we able to - distinguish & differentiate our - Divine Spirit -

so it is that We R able to - Feel & Know -
that which cannot be - seen nor measured -
thus is the Nature of your - Eternal & Divine -
Essence of LOVE - as a - Being Soul Self Spirit -

Namaste my friend - may LIFE find your - Heart & Mind -
Happy & at Peace - in the - realization & creation of - Who U R -

and Thank U for re-engaging in such an Insightfull manner -

@Word - that was & IS - a Beautifull & Brilliant - expression of - Wisdom -

Thank U for sharing such - Insight & Awareness -

MrDragon - "I understand where you're coming from, so, can it be also said that the soul is related to consciousness, self-awareness, and spirit related to the bioelectrical energy that keeps us alive? "

Yes - that is exactly it -
U R - a - Spirit of ENERGY -
inhabiting - animating - direct & controlling -
a physical - biologic - human - animal - body -
a Creature composed of - {matter mass liquid & } -

a Being of ENERGY - being a - form of LIFE -
so it is that - U R & I AM - Divinely being human -