This text explores the concept of telicity or purposefulness, distinguishing between a mere end and a true goal. The author argues that purposefulness requires a change in behavior by a subject, which separates intentional actions from simple processes influenced only from the outside. While processes occur spontaneously or through inertia, actions are directed from within through the internal nature of the subject. This internal regulation imparts a telic character to activities, though the intended goal might only be partially achieved. The study emphasizes that all life is fundamentally dependent on the realization of this telicity. Any disruption in the purposefulness of vital manifestations appears as a defect or disease, which can lead to the destruction of life itself in severe cases. The author concludes that the very possibility of life is inseparable from its purposefulness, asserting that the existence of living organisms stands or falls with the teleological orientation of their vital actions.