Thesis entitled »Soul and happiness in Aristotle: The path to eudaimonia through psychic
perfection« explores Aristotle's conception of the soul and happiness, focusing on the path to
eudaimonia through the development of psychological perfection. Based on the Nicomachean
Ethics and De Anima (On the Soul), the fundamental constituents of the soul, the relationship
between reason and the passions, and the way in which virtuous action leads to the attainment
of the highest good are analysed. The soul is understood not as something separate from the
body but as its functional principle, and happiness as the realisation of rational activity in
accordance with virtue. In the contemporary context, Aristotle's ethical project remains
relevant as a response to superficial conceptions of happiness and as a call for a deeper inner
development. The aim of this work is to show how the psychological structure of the human
being, guided by reason and virtue, constitutes the foundation of a true and fulfilled life.
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