With an eye to fostering an energized and empowered workforce, we explore the discrete emotion of self‐assurance (characterized by boldness, pride, and audacity), investigating how receipt of interpersonal citizenship behavior (ICB) fuels this agentic emotion. ICB includes acts of everyday concern that may be of a person‐ or task‐focused nature. With two survey samples, we propose and test a model that situates self‐assurance as a mechanism linking ICB‐receipt to employee thriving and empowerment. Additionally, we find links to citizenship enactment, as reported by coworkers. Notably, person‐focused ICB‐receipt may be just as beneficial to self‐assurance as task‐focused ICB‐receipt. These results hold equally for working women and men. Our multi‐study, multi‐source results underscore the role of agentic emotion in cultivating a proactive workforce.