It is written in Daniel 9:21 (D.R.)
As I was yet speaking in prayer,* behold the man* Gabriel, whom I had seen in the vision at the beginning, flying swiftly touched me at the time of the evening sacrifice.
Also, in the Catholic Encylopaedia under the entry Devil is written St. Gregory’s saying about the word angel, i.e.: nomen est officii, non naturæ - the designation of an office, not of a nature.
So, here we have:
Gabriel as being expressed as an angel, e.g. Luke 1:19 - The angel said to him, “I am Gabriel…"
Gabriel expressed as a man by Daniel.
A Saint’s stating that the word angel designates an office and not a nature.
With these seen together, how are we to reconcile the expression “Angels are pure spirits without bodies?” It is said they can “take on the form of a body”, and not just as light but also capable of being touched and doing things physically (e.g. Jacob’s wrestling with an “Angel of the Lord”, or Gabriel touching Daniel).
Another observation is with Aquinas’ Summa III Q. 64 N. 7. In his answering, he admits
But it must be observed that as God did not bind His power to the sacraments, so as to be unable to bestow the sacramental effect without conferring the sacrament; so neither did He bind His power to the ministers of the Church so as to be unable to give angels power to administer the sacraments. And since good angels are messengers of truth; if any sacramental rite were performed by good angels, it should be considered valid, because it ought to be evident that this is being done by the will of God: for instance, certain churches are said to have been consecrated by the ministry of the angels
With this in mind, in Luke 24:39 when Jesus says to look at his hands and feet, it is I, touch me, ghosts have no bodies, there seems to be a distinction between ghost and angel here, as if ghosts can not materialize as with the angelic office.
To be more specific with the questions:
- Is Gabriel a man, an angel, or both?
- Are all these functions/attributes of materializing and interacting applicable also to a demon? If not, why not, and what is the source of the judgment regarding the question?