Goals bond people. 
Nicomachean Ehtics. Aristotle, a thinker sometimes cited as the master of them that know, liked to identify categories for things in life. He was an empirical, analytical genius, and polymath who contributed to the development of the process we know as the scientific method and is credited with establishing our classification system for the members of the Animal Kingdom; e.g., species, genus, phylum, etc. The philosopher brought this same powerful thoughtfulness to his examination of human relationships. To paraphrase one of Aristotle’s notes (or perhaps one of his student’s), the philosopher described the highest level of friendship as the relationship between individuals who share an appreciations for beautiful, worthy things.