The term "chassid" is an ancient one that the Sages had even applied to Adam. It describes perfection and excellence in intellect or in emotive character-traits, or in both. In Chabad Chassidic doctrine, the appelation "chassid" refers to one who recognizes his own essence-character and his standing in the knowledge and study of Torah, as well as his situation in observing mitzvot. He knows what he lacks and he is concerned and takes pains to fill that void. He is diligent in obedience in the manner of "accepting the yoke of Heaven."