<p>Never mind that business about a camel passing through the eye of a needle, said to be analogous, in its difficulty, to a rich man entering heaven. In ads all over town, Citibank has been telling us to "live richly," and it is now doing so on a huge billboard -- 140 feet long -- above the portico of Grace Church, at Broadway and 10th Street. The avenue bends just where Grace Church stands, making the 1846 building visible for miles downtown, a beautiful neo-gothic jewel nestled among taller structures, a sacred pause before Broadway veers uptown to theatrical fame.</p>