  Considering relevant and irrelevant high-dimension operators for ordinary and
mirror fermions respectively, we show that the Wilson lattice fermion can
originate from a spontaneous symmetry breaking phenomenon. Ward identities, due
to symmetries at the cutoff, guarantee the cancellation of mirror-fermion
contributions and the infrared limit can be achieved. The Wilson parameter
turns out to be fixed at $r\simeq 0.18$, where the vacuum energy of the system
is minimized.
