Drawn as a conclusion to the colloquium of Bordeaux (June 2003), on mother-child attachment, these reflections open up to new venues. Indeed, the author makes the assumption that attachment and detachment make up a fundamental couple with attachment and detachment, which leads to getting one's autonomy, discovering the world and expressing one's pulsions. The very tension inside this antagonistic and fundamental couple--between attachment and pulsions--would be the origin of all forms of language.