Full Idea
Spirit [thumos] is what produces friendliness [philetikon], since it is the capacity of the soul by which we love [philoumen].
Gist of Idea
Spirit [thumos] is the capacity by which we love
Source
Aristotle (Politics [c.332 BCE], 1327b39)
Book Reference
Aristotle: 'Politics', ed/tr. Reeve,C.D.C. [Hackett 2017], p.168
A Reaction
This is the same 'spirit' which Plato adds to reason and emotion for this three-part soul. There it seems more to denote fighting ability. Aristotle says it produces both fierceness and love. 'For the man de sword, for the woman de kiss'.
Related Idea
Idea 6041 There is a third element to the mind - spirit - lying between reason and appetite [Plato]