Yesterday 

I didn't think of you

Not as much anyway

Today

I thought of you 

A little more

Tomorrow

I will think of you 

A lot more

Yesterday

I didn't see you

Today 

I did see you

Tomorrow

I hope to see you

But I might 

Not see you tomorrow

Because 

We don't know

What tomorrow will bring 

Tomorrow

Is a mystery

Today

Has already 

Been discovered

Yesterday

Was discovered 

Not too long ago 

But tomorrow

Is a mystery