  Collinear and soft divergences in perturbative quantum gravity are
investigated to arbitrary orders in amplitudes for wide-angle scattering, using
methods developed for gauge theories. We show that collinear singularities
cancel when all such divergent diagrams are summed over, by using the
gravitational Ward identity that decouples the unphysical polarizations from
the S-matrix. This analysis generalizes a result previously demonstrated in the
eikonal approximation. We also confirm that the only virtual graviton
corrections that give soft logarithmic divergences are of the ladder and
crossed ladder type.
