  We apply a description of bound states of fermion and antifermion by means of
our approximation to the Bethe-Salpeter formalism that retains part of the
information on relativistic effects provided by the full fermion propagator to
the lightest pseudoscalar mesons. Therein, the pseudo-Goldstone nature of the
latter quark-antiquark bound states is taken into account by appropriately
formulated effective interactions. Scrutinizing the predictions of this
bound-state approach for meson masses, decay constants and in-meson condensates
by relying on a generalized Gell-Mann-Oakes-Renner relation shows that the
light-quark-mass values required for agreement are all in the right ballpark.
