Macbeth

 Tomorrow and tomorrow and tomorrow. 

Just a few things I noticed yesterday. 

The repetition signifies not only the monotony of life but also that every day is the same. 

All our yesterdays have lighted... 

Notice the word play with day and light. 

Death is equated to darkness. Life to light. And in its emptiness to a walking shadow cast by a momentarily alive person. 

Shakespeare went all in with this one. 

Enuff said.