The simplest psychological path for such development would merely be a learning model, as discussed in chapter 5. The more I encounter people who reciprocate my cooperative gestures, the more I come to understand the nature of our potentially beneficial interaction, so that I become trustworthy in the sense that I begin to take others' interests into account in deciding what I do in joint undertakings. When furthering their interests furthers mine and I recognize this fact, they will have potential reason to judge me to be trustworthy.

Russell Hardin, Trust and Trustworthiness, loc. 613