Blind Mary....

"A clear and distinct idea of any thing or proposition can always be conveyed to another by words even if that person has never had it before. All education in the sciences, and especially pure [literally mental!] mathematics, rests on this fact. Who among the world's wise, who has seen a red color, is capable of giving another, who has never seen that red color (for example a blind person), a good or correct conception or idea of the many special qualities [literally modes] which he would experience by words alone? This clearly shows that one can experience many facts of which one cannot have a clear and distinct idea." B. Nieuwentyt (against Spinoza)