Stanford Encyclopedia of Philosophy
The mirror stage is a phenomenon to which I assign a twofold value. In the first place, it has historical value as it marks a decisive turning-point in the mental development of the child. In the second place, it typifies an essential libidinal relationship with the body-image.
Psychoanalytic experience has rediscovered in man the imperative of the Word as the law that has shaped him in its image. It exploits the poetic function of language to give his desire its symbolic mediation. May this experience finally enable you to understand that the whole reality of its effects lies in the gift of speech; for it is through this gift that all reality has come to man and through its ongoing action that he sustains reality.
What is realized in my history is neither the past definite as what was, since it is no more, nor even the perfect as what has been in what I am, but the future anterior as what I will have been, given what I am in the process of becoming.
The man who is born into existence deals first with language; this is a given. He is even caught in it before his birth.