Ravens - Which he mentions because they were most contemptible, especially to the Jews, to whom they were unclean: and because they are not only neglected by men, but also forsaken by their dams as soon as ever they can fly, and so are wholly left to the care of Divine providence.
Like wool - Not only in colour and shape, and softness, but also in use, keeping the fruits of the earth warm. Ashes - In colour and smallness of parts, as also in its burning quality.