what is postive in grammar
“positive grammar,” a term which referred to all those aspects of grammar not subject to general rules.
Positive grammar is historical, teaching the right way to speak while inventing no laws of speech in defiance of custom. Positive, that is, patristic as opposed to scholastic, theology is that which is valuable, pious,
Christian. The positive theologian expresses himself in positive grammar, as opposed to the unlettered theologian unfamiliar with the Fathers.
W4RF - Los Angeles: RSA 2009