This error also often enters into formation of caricatures. Some men are Greek. Therefore, all mortals are Greek. This example is not as far-fetched as it appears. All men are mortal.
Some men are Greek.
Therefore, all Greeks are men. All Greeks are men. Spaniards are not Greek. Therefore, Spaniards are not men. The divisive potential of such arguments, in the Church and in the world outside the Church, is obvious.