@Kolibri
So it is only the Holy Bible that is ‘inspired’ or ‘God breathed’. How do you know that the interpretations of the Holy Bible by the Jehovah’s Witnesses are all correct?
"As for you, Daniel, keep the words secret, and seal up the book until the time of the end. Many will rove about, and the true knowledge will become abundant." - Da 12:4
There are two things we can learn from this verse relevant to your question.
1) the understanding of the book would be sealed until a specific time period.
2) people who 'rove about' within the book would grasp the understanding
when the time was right for it.
So, primarily we are students that wander about thru the 66 books, "examining [them] thoroughly." (Da 12:4 footnote.)
Examining and loving the Bible is not enough to grasp the understanding; we have to be living at the right time for Jehovah to open our minds to understand how the verses link together.
Even Paul wrote "For we have partial knowledge and we prophesy partially." (1 Cor 13:9)
1 Peter 1:19 suggests how understanding would grow with time while encouraging us to keep paying attention.
"So we have the prophetic word made more sure, and you are doing well in paying attention to it as to a lamp shining in a dark place (until day dawns and a daystar rises) in your hearts." - 1 Pet 1:19
So we keep studying, and our understanding grows. As our understanding grows, typically, the most up-to-date understanding finds its way into the publications we print.
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But your question was more personal. How do "I" know that the interpretations of the Holy Bible by Jehovah's Witnesses are as correct as they can be at this moment? My conviction was also gradual. It started when I was exposed to the Witnesses for the first time as a young boy. My parents just started studying and they would take me to a Lutheran/Methodist Sunday school and then my Dad would pick me up and take me to the Kingdom Hall afterwards. I "tasted" a difference in the quality of study fed to all. I clearly remember reading about Daniel and the lion's pit in the Sunday School and asking myself why didn't they teach why this passage shows that we need to be people of integrity, regardless of what we have to face? So, you could say my confidence started with how the Bible was being used to encourage all of us to be better citizens.
Other things stood out too. In the KJV, the name Jehovah shows up 4 times. And yet it hides the name behind LORD and GOD over 6000 times. Why? Just today I read Jeremiah 23:26,27.
"How long will this continue in the heart of the prophets, to prophesy lies? They are prophets of the deceit of their own heart. They intend to make my people forget my name by the dreams they relate to one another, just as their fathers forgot my name because of Ba'al."
So I started to collect identifying marks of a religion where doing what Jehovah asked of them mattered - and weeding out those that did not fit from my own personal examination. (If a bank teller wants to identify counterfeit money he/she examines real money.)
One place to start was the Lord's Prayer recorded at Mt 6:9,10 and the preceding verse 7. Which religions were putting primary focus on honoring and using God's personal name - stressing the need to not soil God's reputation as we live our lives? Which religions really stressed the Kingdom as the only complete solution to mankind's problems? Which religions were taking care "when praying" to not "say the same things over and over again," imagining "they will get a hearing for their use of many words." (vs 7)
As this happened, I got a clearer understanding of some very basic Bible teaching that have always been a part of our (that is Jehovah's Witnesses') understanding, becoming better able to defend the things I was learning. I also became acquainted with some very notable ways that Jehovah's Witnesses historically got the timing right in Bible prophesy. For 40 years in advance, 1914 was looked to as a marked year. There were misconceptions, true; but it really was a beginning of the global fulfillment of Jesus' words about his returned presence and the conclusion of this system of things. In 1942, we learned that the now defunct League of Nations was the "wild beast" that "was, but is not, and about to ascend out of the abyss" of Re 17:7. So we knew that WWII would not end in Armageddon and somehow that political entity would be revived - and it was as the United Nations. (Like it's predecessor many called it "the last hope of concord and peace," (Pope Paul IV, Oct 1965.) making it a rival for God's Kingdom.)
Other fulfillments of prophetic understanding such as that of Da 11 regarding the "king of the north" and the "king of the south" impressed me. The striking detail in which these things came true even hundreds of years after people claimed Daniel was a fraud writing after the fact, both built my confidence that the Bible truly is more than a man's collection of partial myth and history, and that I was experiencing a fulfillment of Isaiah 25:6.
In this mountain Jehovah of armies will make for all the peoples
A banquet of rich dishes,
A banquet of fine wine, (or "of wine kept on the dregs.")
Of rich dishes filled with marrow,
Of fine, filtered wine.
- Isa 25:6
