I'll give you an example:

In court someone might say that this is "here" say. But they never call something "there" say. It's like the phrase is waiting for a definition. The witness "may" say something or "may" do something. But you know what? You never here them the witness "June" say or "February" do anything at all! The Titanic never called a "September day" and in WW2 there was no special day in October.

C'mon! There I say, I January some writing tomorrow, but if I may January that, it means a totally different thing.