According to Lacanian thought there is a period when an infant 'believes' to be one with the world, when it lives in what Lacan calls the Imaginary Order. During this phase the child does not discern between self and Other and sees itself as identical with the world. The overcoming of this stage is linked to the child's entry into language.

Leaving my country, entering another, I acquired a new language.

Lacan also locates here the original feeling of lack.

When saying 'ich bin' one in fact says 'ich, die die (imaginaere) Identitaet mit der Welt verloren hat'.

Wenn man sagt 'I am', sagt man eigentlich 'I who lost the (imaginary) identity with the world'.

The feeling of lack is the location of the original desire, that to be one again with the world. And there is no going back, as one can never get into the same river. It is, in a sense, the Fall.