Obviously, témnō (prunes) and kathairó (cleanses) do not have the same meaning. So which one is used in John 15?
It’s kathairó, cleans or cleanses!
Yabbut, how about the context and the contrast? In other words, the Father takes away branches that don’t abide in Jesus, but prunes those who bear fruit, right? Well, it makes a nice teaching, but actually this is not how it’s done in a vineyard. Notice that the words kathairó and katharos are used again in the same passage to assure the disciples that they are already clean:
“I am the true vine, and My Father is the vinedresser. Every branch in
Me that does not bear fruit, He takes away; and every branch that
bears fruit, He kathairó (cleanses, Strong’s Greek 2508) it so that
it may bear more fruit. You are already katharos (clean, Strong’s
Greek 2513) because of the word which I have spoken to you.” – John
15:1-3 ESV
The teaching that God prunes us that’s based on this passage is an extrapolation based on not knowing about vineyard practices. It assumes that that “cleanses” must mean prunes in this context. Some concordances also include "prunes" as an alternative definition of kathairó apparently based solely on John 15:2.
However, Jesus presented this metaphor to a rural audience who were very familiar with the vineyard practices in the region. Caring for grape vines involves pruning, training, hoeing the weeds, and harvesting. Pruning is done in late winter while the grape vines are still dormant. It involves removing 90% of the previous-year’s vines, leaving only one or two canes connected to the trunk, which are also pruned. These canes are then “trained” on either a stake, a trellis, or as a free-standing bush. During spring and summer, new canes and leaves grow quickly—the leaves are essential for gathering energy from the sun. The earth around each grape vine is weeded to remove any competition for water, which is essential for the vine, and to provide easy access for harvesting. In fall the grapes ripen and are harvested. Then, as winter sets in, the grape leaves drop and the vine goes dormant. That’s it—pruning, training, weeding, and harvesting. Each has its season.
Here’s a key verse out of Isaiah that describes how vineyards were tended in antiquity.
I will make it [the vineyard] a waste; it shall not be pruned or
hoed, and briers and thorns shall grow up; I will also command the clouds that they rain no rain upon it., - Isaiah 5:6 ESV
Here’s a portion of a poem by Virgil written about a generation before the time of Jesus. Note that viticulture was pervasive around the entire Mediterranean.
“This further task again, to dress the vine, Hath needs beyond
exhausting; the whole soil Thrice, four times, yearly must be cleft,
the sod With hoes reversed be crushed continually, The whole
plantation lightened of its leaves. Round on the labourer spins the
wheel of toil, As on its own track rolls the circling year. Soon as
the vine her lingering leaves hath shed, And the chill north wind from
the forests shook Their coronal, even then the careful swain Looks
keenly forward to the coming year, With Saturn's curved fang pursues
and prunes The vine forlorn, and lops it into shape. Be first to
dig the ground up, first to clear And burn the refuse-branches, first to house Again your vine-poles, last to
gather fruit. Twice doth the thickening shade beset the vine, Twice weeds with stifling briers o'ergrow the crop; And each a
toilsome labour.”- Virgil, The Georgics, a poem likely published in 29
BC
The only other place that a form of the word katharos appears in the New Testament is in Hebrews.
For since the law has but a shadow of the good things to come instead
of the true form of these realities, it can never, by the same
sacrifices that are continually offered every year, make perfect those
who draw near. Otherwise, would they not have ceased to be offered,
since the worshipers, having once been cleansed
(kekatharismenous, which is derived from katharos), would no longer
have any consciousness of sins? – Hebrews 10:1,2 ESV
Previously in John 13, Jesus washed the disciples’ feet. In John 13:10-11 ESV, the text reads
Jesus said to him, “He who has bathed needs only to wash his feet;
otherwise he is completely clean (katharos). And you are
clean (katharoi)—but not all of you.” For He knew the one who was betraying Him; it was for this reason that He said, “Not all of
you are clean (katharoi).”
The word “clean” here is katharos (SG2513). It says that Jesus cleansed his disciples’ feet—he didn’t prune them, not even their toenails!
The words for clean and cleansed are used many times in the New Testament and the Septuagint. The disciples were very familiar with the terms, clean and unclean, and the controversies raging among the Judean religious leaders at that time.
To take these verses in context, we look at the “bookends.” The first is in John 13, where Jesus washes his disciples’ feet and tells them that they are clean (katharós) already but need to have their feet washed. Jesus then commanded them to also wash each other’s feet.
The other “bookend” is in John 15, where he uses a vineyard metaphor, but he breaks off the metaphor by telling his disciples that the Father’s goal is for us to bear more fruit for his glory when he cleanses (kathairei) the branch that bears fruit, making it ritually clean!
Jesus then defines what this “cleansing” consists of:
- The disciples were already clean (katharos) through the word Jesus spoke to them.
- That you abide (menó, SG3306, stay, remain, wait) in Jesus and bear much fruit as a result, thus proving to be Jesus’ disciples.
- If you abide in him and Jesus’ words abide in you, then whatever you want, just ask.
- That you abide in Jesus’ love, which is keeping Jesus’ commandments just as Jesus kept his Father’s commandments.
- What are Jesus’ commandments? Here, Jesus tells his disciples in John 15:12 ESV, “This is my commandment, that you love one another as I have loved you.”
Note the similarity of concept in “Blessed are the pure [katharos] in heart for they shall see God.” – Matthew 5:8 ESV
“Cleansing” is not done by pruning, but cleansing continually being accomplished by the Father as we are abiding in Jesus and his love, and keeping his commandments. As Jesus washed his disciples’ feet, we should also humble ourselves and serve our brothers and sisters in Christ.
The “fruit” we should expect to bear in our lives is described in the following two passages:
But the fruit of the Spirit is love, joy, peace, patience,
kindness, goodness, faithfulness, gentleness, self-control; against
such things there is no law. – Galatians 5:22-23 ESV
Let no one deceive you with empty words, for because of these things
the wrath of God comes upon the sons of disobedience. Therefore do not
become partners with them; for at one time you were darkness, but now
you are light in the Lord. Walk as children of light (for the fruit
of light is found in all that is good and right and true), and try
to discern what is pleasing to the Lord. – Ephesians 5:6-10 ESV
Does this mean that the Father never disciplines us? No, but that's not what Jesus was teaching his disciples in John 15.