By the way, the quote doesn't refer to material things, like someone's work, but to a good will and good deeds (see Cornelius a Lapide).
A person who truly speaks the things of God sows faith, hope, charity, peace and understanding; whereas a false prophet in the Church of God, in his preaching and behavior, sows division, hatred, resentment, pride and sensuality. However, the main characteristics of a false prophet is that he separates the people of God from the Magisterium of the Church, through which Christ’s teaching is declared to the world. Our Lord, also indicates that these deceivers are destined to eternal perdition.
The constitution of the Faith must be maintained or you become protestant.