The quote "We are what we do, not what we think" from Iain M. Banks' book "The Player of Games" emphasizes the idea that our identity and worth are defined by our actions rather than our thoughts or intentions. It suggests that it is through our deeds and behaviors that we truly express who we are and how we impact the world around us. This highlights the importance of personal responsibility and accountability in shaping our character.

Furthermore, the quote invites reflection on the nature of self-perception and societal expectations. While thoughts can be powerful, they remain abstract until translated into actions. In this context, Banks encourages readers to consider the significance of their choices and actions, urging them to engage in behaviors that align with their values and aspirations, ultimately defining their legacy through tangible contributions rather than mere contemplation.