  In this paper, using the light-cone lattice regularization, we compute the
finite volume expectation values of the composite operator $\bar{\Psi}\Psi$
between pure fermion states in the Massive Thirring Model. In the light-cone
regularized picture, this expectation value is related to 2-point functions of
lattice spin operators being located at neighboring sites of the lattice. The
operator $\bar{\Psi}\Psi$ is proportional to the trace of the stress-energy
tensor. This is why the continuum finite volume expectation values can be
computed also from the set of non-linear integral equations (NLIE) governing
the finite volume spectrum of the theory. Our results for the expectation
values coming from the computation of lattice correlators agree with those of
the NLIE computations. Previous conjectures for the LeClair-Mussardo-type
series representation of the expectation values are also checked.
