The Clapham Sect was a tightly-knit community of wealthy evangelical Christians who coalesced in Clapham, South London, during the late 18th and early 19th centuries. Their unique culture was defined by shared deeply held religious convictions that mandated social action and moral reform. Living in close proximity, they fostered an environment of constant collaboration and mutual support, allowing for sustained, coordinated efforts in both parliamentary lobbying and public education. This proximity and shared purpose created a 'scenius' – a collective genius that enabled a highly effective, persistent, and morally driven reform movement. They harnessed their social standing and intellectual capacity to address significant societal problems.

The group's methodology combined direct political engagement, particularly through parliamentary action, with extensive philanthropic endeavors and the dissemination of their ideas through publications. Their efforts were particularly spurred by the pervasive issue of slavery and a broader desire to improve the moral fabric of British society, demonstrating how a small, committed group, united by a strong ethical framework, could leverage their resources and connections to drive profound societal change.