frodo was both the weakest and strongest person in the Trilogy?

[Rosa Underhill]

I feel he was the weakest because i couldnt bring himself to kill

On this point, I disagree. As stated above, it takes great strength to stay the hand; a man who kills easily is truely weak.

But I agree about Frodo being both weak and strong. It took strength to bear the burden, but in the end, the burden crushed him and he became weak.