Let's bring thou back

Let's bring back thou and thee and thine,
For personal use, both yours and mine;
They'd add both depth and clarity
To where you stand with they and we.

And what of you, how would you know,
If sole or plural, where you'd  go?
You would be left for public use,
For matters simple or abstruse.

Ideas like this should not provoke
An urge to laugh, much less, to joke;
If we could wake it from its slumber,
We might invoke the dual number!