Gravitational counterterms and Becchi-Rouet-Stora symmetry

All one-loop quantum gravitational corrections to the Einstein action, involving the graviton and the ghosts as bilinears, have been systematically determined in a class of Lorentz-covariant gauges and in a manner which is explicitly Becchi-Rouet-Stora invariant. The procedure explains why certain miraculous relations arise in previous analyses.