„There has been an inversion in the hierarchy of the two principles of antiquity, “Take care of yourself” and “Know yourself.” In Greco-Roman culture, knowledge of oneself appeared as the consequence of the care of the self. In the modern world, knowledge of oneself constitutes the fundamental principle.“

— Michel Foucault

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„To know oneself is, above all, to know what one lacks. It is to measure oneself against Truth, and not the other way around. The first product of self-knowledge is humility…“
— Flannery O’Connor
„Every attainment, every step forward in knowledge, follows from courage, from hardness against oneself, from cleanliness in relation to oneself.“
— Friedrich Nietzsche
„In oneself lies the whole world and if you know how to look and learn, the door is there and the key is in your hand. Nobody on earth can give you either the key or the door to open, except yourself.“
— Jiddu Krishnamurti
„To understand oneself, one needs enormous pliability, and that pliability is denied when we specialize in devotion, in action, in knowledge.“
— Jiddu Krishnamurti