in one's right mind

Compos mentis, kom′pos ment′is, adj. phrase, in one's right mind—sometimes merely Compos.

For to be in one's right mind causes grief: but madness is an ill; yet it is better to perish, nothing knowing of one's ills.

Adj. sane, rational, reasonable, compos mentis, of sound mind; sound, sound-minded; lucid. self-possessed; sober, sober-minded. in one's sober senses, in one's right mind; in possession of one's faculties.

The question remains, … what IS logic? … and what IS being in one's right mind?