These should be seen as the broad outline of Baier-Walther's dogmatics, but please don't assume that this is all. Chapter Three On angels. Among the creatures the most perfect of all those who share from the benefits of divine goodness are those whom Scripture calls angels. Scripture most clearly indicates that such natures, or angels, were given existence by God. However angels are by their natures spirits, or spiritual and corporeal substances, not made out of matter and form.
Further angels are intelligent substances, thus so that the intellect is of their essence.
Natural, revealed or beatific. However by a singular distinction from themselves, especially in regard to material things, which existed by another and at another time, and likewise by accidence, of which they are capable one at a time, successively and in time, angels began to know things. Similarly about the hidden thoughts of humans angels are not able to gather an opinion, unless by seeing signs or deeds that may indicate the hidden thoughts. The free will, or the power of seeking good and turning away from bad, is joined with the intellect in the angelic nature. The facility of speaking was also given to angels, or the facility of manifesting to another the concepts of their minds, so that they are able to speak to God, to other angels, and to humans.