I came across this website which gave me a clear picture of the definition of persona according to Jungian theory:
The persona is a complicated system of relations between individual consciousness and society, fittingly enough a kind of mask, designed on the one hand to make a definite impression upon others, and, on the other, to conceal the true nature of the individual.
– “The Relations between the Ego and the Unconscious” (1928). In CW 7: Two Essays on Analytical Psychology. P.305
Whoever looks into the mirror of the water will see first of all his own face. Whoever goes to himself risks a confrontation with himself. The mirror does not flatter, it faithfully shows whatever looks into it; namely, the face we never show to the world because we cover it with the persona, the mask of the actor. But the mirror lies behind the mask and shows the true face.
– “Archetypes of the Collective Unconscious” (1935). In CW 9, Part I: The Archetypes and the Collective Unconscious. P.43
Every calling or profession has its own characteristic persona. It is easy to study these things nowadays, when the photographs of public personalities so frequently appear in the press. A certain kind of behaviour is forced on them by the world, and professional people endeavour to come up to these expectations. Only, the danger is that they become identical with their personas-the professor with his text-book, the tenor with his voice. Then the damage is done; henceforth he lives exclusively against the background of his own biography. . . . The garment of Deianeira has grown fast to his skin, and a desperate decision like that of Heracles is needed if he is to tear this Nessus shirt from his body and step into the consuming fire of the flame of immortality, in order to transform himself into what he really is. One could say, with a little exaggeration, that the persona is that which in reality one is not, but which oneself as well as others think one is.
– “Concerning Rebirth” (1940). In CW 9, Part I: The Archetypes and the Collective Unconscious. P.221
Nothing is so apt to challenge our self-awareness and alertness as being at war with oneself. One can hardly think of any other or more effective means of waking humanity out of the irresponsible and innocent half-sleep of the primitive mentality and bringing it to a state of conscious responsibility.
–”Psychological Typology” (1936). In CW 6: Psychological Types. P. 964
Nothing in us ever remains quite uncontradicted, and consciousness can take up no position which will not call up, somewhere in the dark corners of the psyche, a negation or a compensatory effect, approval or resentment. This process of coming to terms with the Other in us is well worth while, because in this way we get to know aspects of our nature which we would not allow anybody else to show us and which we ourselves would never have admitted.
–Mysterium Coniunctionis (1955) CW 14: P. 706