Obj. 4: Further, superior power is not subject to the order of an inferior cause. But corporeal nature is inferior to an angel. Therefore an angel can work outside the order of corporeal agents; which is to work miracles.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic power work
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17611/pg17611-images.html

Context

“But when an effect of natural causes is produced outside the order of the natural cause, we call it a miracle, as, for instance, when anyone is cured of a fever without the operation of nature. Therefore the angels and demons can work miracles.
Obj. 4: Further, superior power is not subject to the order of an inferior cause. But corporeal nature is inferior to an angel. Therefore an angel can work outside the order of corporeal agents; which is to work miracles. On the contrary, It is written of God (Ps. 135:4) : "Who alone doth great wonders."
I answer that, A miracle properly so called is when something is done outside the order of nature. But it is not enough for a miracle if something is done outside the order of any particular nature; for otherwise anyone would perform a miracle by throwing a stone upwards, as such a thing is outside the order of the stone's nature.” source