In this dissertation, I explore the Finnish construct of sisu denoting the enigmatic human ability to surpass one's preconceived limitations in times of adversity. The partly autoethnographic dissertation was inspired by my own encounter with trauma and William James' century-old questions pertaining to the "limits of human power" and the differing "paths of access, or keys" between individuals accessing this inner strength (1907, p. 332). It presents sisu as a fundamental and universal phenomenon consisting of aspects such as transcendence, gentleness, interconnectedness, and our capacity to adjust our behavior to enable better life. Sisu is also described as an expression of gentle power through which one might not only survive but overco...