Cote Following on from what niminy said the Bible describes God as a spirit. The best way I can describe spirit is this:
Since something a spirit is a non -physical entity, it does not exist in the physical sense. So cannot be proved to exist.
A spirit is believed to act as an agent affecting physical matter. So any changes could be described a physical manifestation of spirit but only if you believed in the possibility of spirit, otherwise they would be seen as spontaneous. So it still cannot be proved a spirit was the causal link.
www.merriam-webster.com/dictionary/spirit
However people can recognize spirit in other ways. Books can be described as containing spirit, reading them can affect a person emotionally as they get involved in the story, there can even be physical responses for example the heart rate could raise if they were particularly exciting. Many people do not like violent films or video games as they believe it desensitizes a person to violence. Zeitgeist is said to be another form of spirit, cultural beliefs affecting an individual. People are often described to be in low or high spirits.
There is 'Game of Thrones' quote I like that talks about people being able to live a thousand lives through reading books. You yourself said you make decisions based on your own and other people's experiences.* The Bible contains some very ancient accounts of people's lives but on reading it I am struck on how these people come across the same dilemmas, have the same motivations and aspirations as people today. So as you refer to your own and other people's previous experiences, I also do, but include the experience of those people from the Bible in my consideration.
"I believe in the kindness of people etc but that is not the same thing, since that is about expecting to see something I have already witnessed in others....
...I don't have to learn the specifics of every scientific discipline & verify their every study hmm Other scientists do it for me. Studies are replicated, their results peer-reviewed, meta-analyses are done."*
And you still have not said what you think about the possibility of talking carrots! 
articles.mercola.com/sites/articles/archive/2013/08/10/mycorrhizae-plant-communication.aspx
^another article. I have studied some linguistics and know the sheer variety of forms language can take, so this plant communication is fascinating to me. Daniel Everett found, for example, that the Pirahã people have no recursion in their language, no narrative, because anything outside of immediate experience is seen as Taboo and is said to have gone out of existence.