The mutual transparency of ruling parts. Two symmetrical infinitive commands. The first — to enter (εἰσιέναι) into the TERMruling part of each person: not to judge by the outside, but to get through to the center from which a person forms judgments and gives assent. This is a practice habitual to Marcus — to "be in the speaker's mind" (6.53), to see by what doctrines another is moved (8.14). Understanding in place of condemnation: whoever has seen another's ἡγεμονικόν from within has nothing to be astonished at and nothing to be angry about.

And — to open one's own. The second command is the more surprising: to allow (παρέχειν) every other, too, to enter into one's own ruling part. The transparency is reciprocal. The Stoic who has nothing to hide lives "in the open": his ἡγεμονικόν harbors no designs he would be ashamed of before a witness (cf. "the deity which is in thee" — 3.5, one's own guardian; and 3.4: to think only what one could openly avow if suddenly asked). Openness is not naïveté but a mark of purity: the one whose judgments are sound has nothing to conceal. The mutual entering of ruling parts is the extreme image of DOGMAsociability: rational beings form not a juxtaposition of closed citadels but a community of mutually pervious minds. The governing discipline is action: one's stance toward the fellow-members of the common reason.