This chapter presents the classical Thomistic understanding of the human act (actus humanus) as a deliberate action proceeding from both intellect and will, making it the subject of moral evaluation. The morality of any act is determined by three sources: the object (the act itself), the intention (the agent’s goal), and the circumstances. For an act to be good, all three must be good. This framework is then compared with modern psychology and neuroscience, which highlight the influence of emotions, cognitive biases, and unconscious processes on decision-making. The chapter concludes by examining how the modern digital “hypnosphere” poses a unique threat to human agency, not by overt coercion, but by algorithmically shaping our initial desires and perceptions, thus compromising the integrity of the human act at its very root.