Interesting. I wonder if the phrase was "like the good silver."I have another association with good silver: it's something that you don't use everyday, but store and take out only on special occasions. If this is what your co-worker had in mind, the idea is that English should be used daily, and not only on rare occasions, or in class, etc.
Perhaps it was. It seems to me that either would work. A Google search produces several of examples with a descriptor inserted, such as:Interesting. I wonder if the phrase was "like the good silver."