self-possessing

For it would follow that, in the sphere of things not exempt from modification, sense-perception would occur in every part having relation to any other part: in a whole, however — having relation only to itself, immune, universally self-directed and self-possessing — what perception could there be?

The Six Enneads. Plotinus 1952

The ladies of England peculiarly excel in this species of annihilation; and while they continue to drown puppies, as they daily do, in a sea of sarcasm, I think no true Englishman will hesitate one moment in giving them the preference for tact and manner over all the vivacious French, all the self-possessing Italian, and all the tolerant German women.

English Satires Various 1885

That willing is in harmony with knowing and feeling, is primarily strictly natural; in man, however, as distinguished from the much earlier self-possessing animal, this agreement is primarily only approximative; the will must be exercised in order to be sure of itself; man must first learn how to use it.

Christian Ethics. Volume II.���Pure Ethics. 1819-1870 1873

Englishman will hesitate one moment in giving them the preference for tact and manner over all the vivacious French, all the self-possessing

The Voyage of Captain Popanilla Benjamin Disraeli 1842