I am not a teacher ...
... But in my opinion it could be, "If we want to be logical, we must have a sensitivity to language and we must know how to use the language effectively, beacuse logic and language are inseparable."
But unfortunately, you read it out of context, because the author states more reasons to "being logical":
"It (being logical) also presupposes our having a
healthy respect for the firm factualness of the world in
which we live, for logic is about reality. Finally, being logical
presupposes a lively awareness of how the facts that are our
ideas relate to the facts that are the objects in the world, for
logic is about truth. In this first part of the book I will discuss
those attitudes, points of view, and practical procedures
whose adoption prepares the mind for a successful engagement
So it is not only about logic and language, but logic and many aspects and I think the last sentence of the afore-mentioned book extract speaks volumes.
Student or Learner