'Mighty Works' in the Bible

Then, began he to upbraid the cities, in which had been done his noblest mighty works; because they repented not: -

and, coming into his own city, began teaching them in their synagogue, so that with astonishment were they being struck, and were saying - Whence, hath, this one, this wisdom, and the mighty works?

And he did not, there, many mighty works, because of their unbelief.