I don't believe there is any sort of soul or spirit that exists as an independent entity or one that is separable from the physical body. I use the words soul and spirit, but I mean them as aspects of (mortal) humanity.
@Garlicking, so you are only accepting of physical phenomena of life other words(?).
In beginning to grasp/accept the concept of the spiritual I think it might be useful to lose the stereotypical image of a ghost in art or literature and start to explore what the word actually denotes, what sort of phenomenon.
The expression, 'Zeitgeist' gives a good illustration. Literally translated as 'spirit of the time'. The phenomenon shows how social and historical context affects people's attitudes, thoughts and behaviours to such an extent it can be a force in and of itself.
Jesus describes His words as,
"...the words that I speak unto you, they are spirit, and they are life." (John 6:63)
In John 1 it is written,
"1 In the beginning was the Word, and the Word was with God, and the Word was God." (John 1:1)
These two pieces of scripture emphasised the power of language in shaping culture and people and also how language reflects our cultures. Anthropologically, studying different languages and the interplay between this and people's perceptions and their environment can give an insight into how something that is bigger than any one individual or group of individuals can affect people.
In the last thread there was a lengthy discussion concerning evolution, nature/nurture, epigenetics and the interplay between natural selection, individual choice, culture, society, God and how this all can affect our biology in the shorter and longer term.