# Euler-Lagrange eqs. use in QFT [duplicate]

It is known that in QFT the Euler-Lagrange equations are used to obtain the equations of the quantum fields. Nevertheless, from the path integral's point of view (where you integrate over all $$\it{paths}$$/possible field configurations, even if they don't satisfy Euler-Lagrange) the use of this equations makes only sense if you are looking for the classical field, since this one satisfies the least action principle.

So, why do we use these equations to obtain the ones for the quantum field?