That's right. And a good tree cannot bring forth evil fruit.
True... But can a good tree become a bad tree? Surely there are things that happen to good trees to cause them to become bad, producing bad fruit, right? I don't recall that Jesus mentioned that issue, other than the fact that we are all "bad trees" by choice and by birth, yet we become "good" because of Christ's imputed righteousness.
No, a corruptible being. He wasn't created corrupt. He was created subject to corruption. He was created weak and mortal.
I agree with that statement.
We've got to stop considering sin an ability. It's the lack of ability. God is all powerful. He has all power and authority. Nothing is impossible. Yet it is impossible for God to lie. God cannot sin.
But, God is not us... Sin is both an ability and a choice. We, in our current state have had the choice removed from us, in a manner of speaking. Not that we cannot make a good choice, as would a good tree bear good fruit, but rather that we probably will not make that choice based on our cursed nature.
I do like the way you phrased sin as a lack of ability however. Seems to fit with what I am trying to say.
Evil fruit springs from corruption. There is no exception.
I'm not sure we can be as forceful on the "no exception" clause you tie to this statement. I read in my Bible that God works out all things for good...
That's already been argued. You're saying that Adam was the only good tree that could bring forth evil fruit. Christ was applying a universal principle to prophets. It can be applied to any situation.
No, I'm arguing that Adam was a good tree made into a bad tree, and that as a bad tree, he produced bad fruit.
I've been in horticultural work for decades, and I find a good many of the biblical illustrations that use a horticultural basis are misunderstood by a good many people in an otherwise good-hearted effort to grasp what Christ or one of the other inspired writers are trying to say. I've seen otherwise "good" trees that were corrupted by outside influences, disease, bugs, drought, cutting their roots, etc. Once corrupted they seldom, if ever, recover, and yes, the "fruit" produced by those trees is also corrupt to an extent, save for the fact that a seed may actually produce another good tree... The concept is not as universal as you are trying to make it, neither with Christ nor with horticulture.