You keep forgetting?
Do you have a problem with those texts? Do you think Jesus never said them, but that they were added by wicked men?
Do you think that what Paul said about people wanting to have their ears tickle by watered down truth was as error?
Do you recall John 6, when Jesus realized that the people were looking for him not because of his teachings, but because they wanted another belly full, how he gave them a teaching that exposed their true motives?
Jesus did not hold back and say,
"Oh dear. They are getting uncomfortable. Let me change my tune a bit."
It makes for good reading, and meditating on it helps us learn something about God and his son - They don't want rice followers.
Note the results:
John 6:60-69
60 When they heard this, many of his disciples said: “This speech is shocking; who can listen to it?” 61 But Jesus, knowing in himself that his disciples were murmuring about this, said to them: “Does this stumble you? 62 What, therefore, if you should see the Son of man ascending to where he was before? 63 It is the spirit that is life-giving; the flesh is of no use at all. The sayings that I have spoken to you are spirit and are life. 64 But there are some of you who do not believe.” For Jesus knew from the beginning those who did not believe and the one who would betray him. 65 He went on to say: “This is why I have said to you, no one can come to me unless it is granted him by the Father.” 66 Because of this, many of his disciples went off to the things behind and would no longer walk with him.
Did Jesus run behind them and say, "I'm sorry. Let me put it another way? No.
He did this:
67 So Jesus said to the Twelve: “You do not want to go also, do you?” 68 Simon Peter answered him: “Lord, whom shall we go away to? You have sayings of everlasting life. 69 We have believed and have come to know that you are the Holy One of God.”
What an excellent example for his followers today.
He was interested in those few, who loved his word - all of it.
To reemphasize, he said,
"no one can come to me unless it is granted him by the Father."
I don't recall naming anyone. Did I?
If you really want to know what Jehovah's Witnesses think about Luther and Calvin, all you have to do is ask, or go the their website jw.org, and type their names in the search bar.
However, I would be glad to answer, if you want to know the truth.
Or you can ask other Jehovah's Witnesses here.
Oh, by the way
@exchemist, millions of thinking people listen to, welcome, and appreciate Jehovah's Witnesses, even though they have not made up their minds to join them.
For the most part though, they agree that the message they hear, is not based on the thoughts of the Witnesses, but based on the Bible, which they examine for themselves.