A concept that stood out as I read Johnson's essay about Hamlet was his idea that " Hamlet is, through the whole play, rather an instrument than an agent." Hamlet's lengthy recurring debate on being the avenger or not being the avenger of his father's murder practically takes up his whole time, leaving little or nothing left for his scheming of the actual revenge. I laugh when I think about Hamlet like this, it's quite absurd yet not far form reality. How many college graduates now wander through the streets of big cities in search of jobs? How many of them are actually capable of using what they learned and actually apply them? Studying philosophy for example, is one that will obviously drive your mind to the infinite and beyond, but how much of it is applicable on a daily basis? Ok. I'm sorry philosophy wasn't the best example, actually its a little bit of a terrible example, but it made the point. Anyway, what I mean is Hamlet's university education and fanfare in a way, cursed him. Because Hamlet's intellect takes over his instinct preventing him from taking action, his now obsolete physical contributions to the act of revenge leave him with nothing more than doubt.
Now. Why does Johnson claim Hamlet's an instrument? If it's not clear by now here it goes.
Hamlet's intellect is intact, thus, he can still use it as an advisor of some sort. However, because he doesn't have the 'agent' factor in him, he needs someone to avenge the death for him. In the end, he does, get his 'agent' or 'agents' since he doesn't kill Claudius by himself but with a series of events that serve as 'agents' like Gertrude's accidental poisoning and the death of Laertes.