This treatise aims to highlight both the concept of the good and the concept of happiness through their dialectical relationship. According to the definition in the preamble of the Nicomachean Ethics, the good is what everything, not just everyone, desires, wishes for, and pursues. Although Aristotle's ethical treatise primarily refers to human goods, the concept of the good as an ontological good also encompasses the goods of other beings, such as animals and plants, and constitutes the affirmation of Being. All of nature, the entire world, according to Aristotle's teleological view, is directed towards the good, towards its inherent perfection. For Aristotle, the relationship between the good and purpose is given. It is a dialectical relationship. However, the most perfect good seems to be a final purpose. If there is only one final purpose, then it is the sought-after good, namely happiness. Happiness is the most perfect practical good, always chosen for what it is and never for the sake of another good. Happiness, as the most perfect good, is identified with the unique and absolute ultimate goal of man as man and lies in the performance of his inherent work, his work as a rational being, in other words, the exercise of his intellectual and moral powers. Therefore, happiness is nothing but the activity of the soul according to virtue, and if there are multiple virtues, then the quintessential happiness is the activity of the soul according to the most important and complete virtue.