Para cuidar de si

Between the pole of the meditatio [...] and the pole of the exercitatio, [...] there is a whole series of other possible practices designed for proving oneself.
[...]
Epictetus insists that one must be in an attitude of constent supervision over the representations that may enter the mind.
[...]
One can see that this control of representations is not aimed at uncovering, beneath appearances, a hidden truth that would be that of the subject itself; rather, it finds in these representations, as they present themselves, the occasion for recalling to mind a certain number of true principles [...] and by means of this reminder one can see if he is able to respond in accordance with such principles.

- Foucault, The Hermeneutic of the Subject