Is it ensure, insure, or assure?
superego su·per·e·go (sōō'pər-ē'gō, -ěg'ō)
n. pl. su·per·e·gos
In psychoanalytic theory, the division of the psyche that censors and restrains the ego and has identified itself unconsciously with important persons from early life. It results from incorporating the values and wishes of these persons into one's own standards.