Aristotle

Learn your Logic, Kiddos

And the attempts of some who discuss the terms on which truth should be accepted, are due to a want of training in logic [lit. ‘a lack of learning of the analytics,’ Gk. ἀπαιδευσίαν τῶν ἀναλυτικῶν]; for they should know these things already when they come to a special study, and not be inquiring into them while they are pursuing it (emphasis added).

Aristotle, Metaphysics, 4.4 (1005b2-5)