This talk was given by Shaila Catherine as a part of the series "Enhancing Mindfulness Skills: A Seven-Week Series Dedicated to Cultivating Transformative Insight." Mindful of the thinking process, we explore how thoughts function in our lives. Unwholesome mental patterns can reinforce obsessive desires, identification, rigid opinions, and attachment to belief systems. What patterns are most common for you—planning, rumination, fantasy, rehearsing, daydreaming, judging, comparing, fixing, instructing? We observe the types of thoughts that arise, and reflect on whether those thoughts support our values and purpose. We learn to let go of unskillful thoughts and then focus our attention so that we use the mind skillfully. Buddhist tradition identifies three sources for proliferating thought: craving, conceit, and views. By examining the sources of conceptual proliferation, we can curb the wandering tendencies of mind.