Full Idea
Logic is part of a normative theory of thinking, not a substitute for thinking.
Gist of Idea
Logic guides thinking, but it isn't a substitute for it
Source
Ian Rumfitt (The Logic of Boundaryless Concepts [2007], p.13)
A Reaction
There is some sort of logicians' dream, going back to Leibniz, of a reasoning engine, which accepts propositions and outputs inferences. I agree with this idea. People who excel at logic are often, it seems to me, modest at philosophy.