This document discusses the importance of culture in DevOps. It argues that without changes to behaviors and culture, DevOps initiatives are doomed to fail. Specifically, it discusses how IT culture has become too focused on rationality and technology over chaos and irrationality. It also discusses the need for organizations to shift from a blame culture to a just culture that embraces learning from failures. Key aspects of an effective DevOps culture discussed include blameless post-mortems, embracing failure for learning, empowering teams, and removing silos. Recommended publications on further developing an effective DevOps culture are also provided.