  We revisit the Rellich inequality from the viewpoint of isolating the
contributions from radial and spherical derivatives. This naturally leads to a
comparison of the norms of the radial Laplacian and Laplace{Beltrami operators
with the standard Laplacian. In the case of the Laplace{ Beltrami operator, the
three-dimensional case is the most subtle and here we improve a result of Evans
and Lewis by identifying the best constant. Our arguments build on certain
identities recently established by Wadade and the second and third authors,
along with use of spherical harmonics.
