The artist of reason, or philodox, as Socrates calls him, strives only for speculative knowledge, without looking to see how much the knowledge contributes to the final end of human reason; he gives rules for the use of reason for any sort of end one wishes. The practical philosopher, the teacher of wisdom through doctrine and example, is the real philosopher. For philosophy is the idea of a perfect wisdom, which shows us the final ends of human reason.
Immanuel Kant, Lectures on Logic. 'Artist of reason' here seems to be fairly literal; a translation that would perhaps convey Kant's point better would be 'technician of reason'.
