Translate the following English sentence to French:
"After all, the work which forms the core of the European Union has to do with the internal market and that method of working in terms of community legislation that is in the spirit of Monnet."
Le travail qui constitue le noyau central de l'Union est lié au marché intérieur et à la méthode fondée sur le droit communautaire, dans l'esprit de Jean Monnet.