I recently had a discussion with my father about how things such as apologies, forgiveness, love, and other abstract concepts are "proven". For instance, one couple might have a verbal exchange of "I love you", and "I love you", and find essential meaning within this exchange. There is an interpersonal transaction that is found therein. However, for others, the proof is in the pudding. To them you are not "sorry" unless you have proven your regret by their means. It should be noted that a concrete proof never actually satiates an abstract notion in my opinion, it only satiates a personal desire. Of course, there's another route: finding consistency within the abstract concept.
How do you, as an individual, reconcile things of this nature?