  Nonperturbative Wilson coefficients associated with the leading
chiral-symmetry-breaking operators in the operator product expansion of the
pseudoscalar QCD correlation function are derived. Implementation of the new,
instanton-induced operators enables the corresponding spectral sum rule to
reproduce the small pion mass scale, thereby reconciling it with Goldstone's
theorem. The same operators suppress the contributions of pionic resonances.
Several predictions and structural insights from the new sum rule are
discussed.
