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Friendship (φιλία) is an important part of the spirit of ancient Greek society and an important concept in ancient Greek ethics. In Plato, friendship was born from eros (έρως). Eros itself has a threefold meaning, as physical sexuality, as friendship with others, and as the love of man and God in the pursuit of wisdom. Friendship is thus linked to the highest purpose of the soul. Aristotle inherited and developed Plato's theory. According to Aristotle, friendship was not born from eros, but on the contrary, eros is a special form of friendship. Friendship is not an impulse of desire, but part of the good life of practicing reason.
Zhongchuan Ge (Sun,) studied this question.