President Hinckley’s message that potential converts from different religions should “bring all of the good” they have learned to Mormonism so that “we may add to it” is an interesting paradox in religious pluralism. It assumes that there is good to be found in other religions (an idea which may have been absurd to some General Authorities in the past), but it also implies that Mormonism contains a fuller collection of truth. Moreover, the challenge to “bring” makes it sound as though the potential converts will continue their religious practices; but is that be possible in a Mormon framework?
Perhaps President Hinckley did not intend for anyone to continue their old religious traditions. In that case, “good” is just a euphemism for “morals” or “ethics” – behavior that we can all agree on. But let’s assume the Prophet actually meant religious practice alongside ethics.