"He might not come. He might just send a message. He doesn't always come."
Gus says this in Part three in reference to Wilson, for whom Ben says they must wait. Wilson is similar to the god-like Godot in Samuel Beckett's Waiting for Godot, who also keeps two characters in suspense as they wait for his arrival. Wilson's power is greatly derived from his very absence, similar to the way silence functions in the work in terms of the absence of language. Wilson is a mystery to both of them, and Gus, particularly, feels uncomfortable around him. The fact that Wilson sometimes sends messages indicates that the later messages through the dumb waiter and the speaking tube may be from him, or at least through one of his henchmen.