"Whoever receives a prophet as a prophet will be given a prophet's reward, and whoever receives a good man because he is a good man will be given a good man's reward."
Matthew 10: 41-42.
"For the words that the mouth utters come from the overflowing of the heart. A good man produces good from the store of good within himself; and an evil man from evil within produces evil."
Matthew 12: 34-35.
I've been observing, and somewhat participating, in a few discussions regarding the good fruits one produces, and what is considered 'good' in the first place. Most of the time, the definition of good here gets defined somewhere along the lines of faith in God/Christ, or the good works/fruits produced are speaking of the faith in God/Christ.
However, is that how any of the listeners in the Gospels would've understood the word "good?" Or would they have defined "good" based on characteristics? Compassion, mercy, loving kindness. Such as the two verses above -- people hearing those, how would they have defined the good people? The good man who is received by another, what makes that man good? The good man producing good because of the goodness stored within himself -- what is this goodness stored within him?
In most cases, when we see a contrast between a good person and an evil person, or we hear of a good person being received, we get the impression that there are actually good people, and that we'd recognize these people based on their qualities and actions. If a good person is received by another, then a kind person has been received. Someone who loves his/her neighbors and enemies. Someone who pursues peace.
What we don't mean by "good" is someone who has faith in God, or someone who is a Christian. "Good" has a definite value assigned to it, a concrete definition that we can measure anyone by. Same with "evil." An evil person is a murderer, a rapist, a terrorist, to name a few. The definition of "good" should not suddenly have a relaxed, relative definition.