This text explores the relationship between the psyche and spontaneity, defining the psyche as an extraordinary bodily function that significantly enhances the effectiveness of spontaneity in coordination with reactivity. The author posits that spontaneity is a legitimate concept supported by personal experience and the systematic observation of animals. Especially in higher animals, recurring moments of hesitation and decision-making between various options can be observed, suggesting the involvement of internal spontaneity in situations where clear external cues for further action are absent. The text critiques the traditional mechanistic and causal view that interprets such behaviors merely as complex chains of cause and effect, labeling this approach as prejudiced. Instead, it emphasizes that the capacity for choice and the internal dynamics of the subject are key aspects that cannot be reduced to simple reactivity. The reflection thus leads toward a philosophical understanding of the psyche as a tool that enables the subject to actively shape its behavior through spontaneous processes, which become most evident in situations of uncertainty and choice.