Full Idea
In logic the question is not one of contingent but of necessary rules, not how to think, but how we ought to think.
Gist of Idea
Logic gives us the necessary rules which show us how we ought to think
Source
Immanuel Kant (Wiener Logik [1795], p.16), quoted by Michael Potter - The Rise of Analytic Philosophy 1879-1930 02 'Trans'
Book Reference
Potter,Michael: 'The Rise of Anaytic Philosophy 1879-1930' [Routledge 2020], p.16
A Reaction
Presumably it aspires to the objectivity of a single correct account of how we all ought to think. I'm sympathetic to that, rather than modern cultural relativism about reason. Logic is rooted in nature, not in arbitrary convention.