Theophylact of Ohrid
Catena Aurea · Johannesevangelium 14
Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also: and greater works than these shall he do; because I go unto my Father. And whatsoever ye shall ask in my name, that will I do, that the Father may be glorified in the Son. If ye shall ask any thing in my name, I will do it.
This is an explanation of the doctrine of miracles. It is by prayer, and invocation of His name, that a man is able to work miracles.