In the Two Towers, when hiding outside Minas Morgul while the Lord of the Nazgul is passing, Frodo has these thoughts:

> 
> He knew that the Ring would only betray him, and that he had not, even
>  if he put it on, the power to face the Morgul-King - not yet.
> 
> 
> 

This seems a very carefully worded line and the last two words "not yet" imply to me that Frodo in some way is anticipating a time when he may have the power to challenge Sauron or the Lord of the Nazgul. What are other peoples thoughts about this particular thought of Frodo? Is this simply madness caused by bearing the ring, or does he indeed believe and intend to challenge Sauron at some stage? Is this ever touched upon in other middle earth literature?