There are two kinds of faith:
1) Trusting our Father and THEREFORE acting upon what we believe. This is Faith in/toward God.
2) KNOWING something we have just commanded WILL manifest as we have said. This is the Faith of God operating in us.
People tend to grow in #2 because they have done well with #1, because living out a lifestyle of #1 increases one’s ability to KNOW God will manifest power, (which is faith #2).
The main exception to that rule is when it comes to someone who got saved and was just handed a gift of faith. This is rare but it does exist.
Jack Coe was a prime example of this.