And my mustering enough faith on their own?the phrase "not of works lest any man should boast" is a clue. It clarifies what the gift is.
When the Bible speaks of works, it refers to people who think they can earn salvation by their own effort.
But this verse is saying that salvation is not of works, instead salvation is a gift
Salvation is the gift. So is the means that brings it about.
If faith is not a gift of God then what is it?