The Buddha instructed us to bring awareness to the five aggregates of form, feeling tone, perception, mental formations and consciousness and to notice how we cling to and identify with them. If we cling and identify we will suffer. Non-clinging = Non-suffering.
After a brief review of the First and Second Foundations, we explore the Third Foundation: 1. as mindfulness of thoughts and emotions, and 2. as mindfulness of the presence or absence of greed, hatred and delusion, offering a number of practices for both.