I've been in many apologetic interfaith discussions about epistemology and that passage has come up a lot. "By their fruit you will recognize them . . ." I've heard a variety of interpretations of what fruit Jesus was talking about, mainly fitting in three categories.
Besides, even if I give those three categories the benefit of the doubt, they still leave some serious questions open.
In my opinion, it makes a lot more sense to harmonize Jesus and Paul. Since Jesus didn't specify what kind of fruit he was talking about, the most reasonable interpretation is reading his words through the lens of what Paul taught on the issue. The most direct and obvious fruit a prophet or teacher produces is their teaching, so we're supposed to judge any religious teacher and certainly any prophet by comparing the gospel they teach with the gospel the Apostles taught, which we have in scripture. Does that sound like a valid interpretation of what Jesus and Paul taught?
- Fruit is moral behavior. If a prophet or teacher has a pattern of wanton sinfulness, that's an example of bad fruit.
- Fruit is positive outcomes. If you join a different church and your life improves in some way, that's an example of good fruit and evidence the church is true.
- Fruit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control. If you experience that fruit in yourself or other members of a church, that is evidence the church is true.
Besides, even if I give those three categories the benefit of the doubt, they still leave some serious questions open.
- No one in my discussions has claimed their prophets or leaders have been perfect. So if a true prophet can still be less than perfect, what level of moral behavior should be seen as good fruit or what sins should be seen as bad fruit?
- Some of the positive outcomes people have mentioned occurred week, months or even years after joining their church. How do we know a positive outcome was a result of following a teaching? Some of the results are obvious. An alcoholic will likely see many positive outcomes by following what the Bible teaches about drunkenness, but does that mean every church with AA meetings is a true church?
- Many atheists or people in other religions appear to have some form of love, joy, peace, etc. in their lives. That either means the fruit of the spirit is available to people in a wide variety of belief systems or humans are incredibly unreliable when it comes to discerning their feelings. Either way, how can that be a reliable way to know a church is teaching the true gospel of Christ?
In my opinion, it makes a lot more sense to harmonize Jesus and Paul. Since Jesus didn't specify what kind of fruit he was talking about, the most reasonable interpretation is reading his words through the lens of what Paul taught on the issue. The most direct and obvious fruit a prophet or teacher produces is their teaching, so we're supposed to judge any religious teacher and certainly any prophet by comparing the gospel they teach with the gospel the Apostles taught, which we have in scripture. Does that sound like a valid interpretation of what Jesus and Paul taught?