How can we know if we actually believe and it's not just a mere profession of faith held in our neurons?
How can we know we truly experienced the Holy Spirit and not our consciousness making the experience?
And how do we know if the dictionary and definitions have been changed by satan or someone?
Is it bad that I am such a fierce rationalist, like Rene Descartes?
Yes, how horrible it is! You horrible rational person! lol - NO... That is a good thing.
It is not bad to be rational. Over analyzing can get painful, but God will use it for good. I've been there. He is a good Father.
The fact that you care for one is evidence, because without the Holy Spirit you would not care.
Secondly, just this:
1 John 4:7-16
7Beloved, let us love one another, for love is of God; and everyone who loves is born of God and knows God. 8He who does not love does not know God, for God is love. 9In this the love of God was manifested toward us, that God has sent His only begotten Son into the world, that we might live through Him.
10In this is love, not that we loved God, but that He loved us and sent His Son
to be the propitiation for our sins.
11Beloved, if God so loved us, we also ought to love one another.
12No one has seen God at any time. If we love one another, God abides in us, and His love has been perfected in us.
13By this we know that we abide in Him, and He in us, because He has given us of His Spirit. 14And we have seen and testify that the Father has sent the Son as Savior of the world. 15Whoever confesses that Jesus is the Son of God, God abides in him, and he in God. 16And we have known and believed the love that God has for us. God is love, and he who abides in love abides in God, and God in him.
This is the validity test.
It tells us flat out whether we know God by giving us the gauge for if we do or if we do not know Him.
The Holy Spirit speaks through the Word of God. The Scriptures are what He speaks to us with. It is what He reminds us of and often it is what He uses to answer many of our pressing questions.
Child-like faith is not blind faith, but it is whole-hearted belief in the person you are trusting.
Matthew 28:20
teaching them to observe all things that I have commanded you; and lo, I am with you always,
even to the end of the age.” Amen.
If He says He is with you, He is with you. God does not, and cannot, lie. Whether we trust what He said is what matters.
If you have doubts, ask Him to show you and He will. PUSH - Pray Until Something Happens. If you ask and stick with it, He will answer you. He might want you to ask more than once. Often our level of devotion to a question or request to God is measured by how seriously we engage Him in prayer.
Matthew 7:7
Luke 18:5
Daniel 10:12-13
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While I understand your concerns about the dictionaries and meanings of words, validity of scripture, etc...
After much research of my own I have learned that God will only allow so much and we can trust the Bible because it has been scrutinized and preserved by Him.
If you need to study up on this, I do encourage it. Gary Habermas has a minimal facts resurrection theory for faith in Lord Jesus' resurrection.
Daniel B. Wallace is a good resource to follow up on for accuracy of the original manuscripts.
Lee Strobel has did digging into textual criticism as well, and at that, mostly of the New Testament.
The Old Testament is pretty solid, and we have it in Greek form in the Septuagint version written by 70 scholars before Christ.
The Dead Sea Scrolls have also increased the verifiable accuracy of the text as a whole.
You can also look into brother Chuck Missler's presentation titled "Knowing God - An Extraterrestrial Message."
It covers how the message of the Bible is cohesive to such a great extent that it could absolutely only have one author, and that author being from outside of time.
While I have an issue with brother Voddie Baucham on his calvinism lol, He does do a great presentation on why we can trust the scriptures / text.
It is titled "Why you can believe the Bible - Voddie Baucham" - But don't let him snag you into thinking God hates some people. Just refer back to John 3:17 and 1 John 4:8 if calvinism starts to get to you. lol... It says "God is love" - Not hate.
These are great starting points.
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The ultimate test though in trusting God, is praying and talking to Him about things that are going on.
Asking Him to help you. Asking Him for guidance. Taking the guidance you know in your heart He is giving you. And then seeing that He really is truly working in your life and helping, guiding, holding you by the hand.
Without an active prayer life, and without reading the Bible (He often answers my prayers WHILE I'm reading), we give Him less opportunity to help us and show us that He is faithful and really truly there and trustworthy.
The relationship we have with Him must start with us believing what He has told us. He loves us, and sent His Son to die in our place.
If we will give Him belief in that, He will show Himself faithful in our relationship with Him from there graciously.
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To know it is Him will take more praying than getting answers from others, but isn't too hard.
Being patient, and listening intently in your heart without interjecting helps a lot.
He speaks to our hearts, not our heads.
If it is scripture that comes to mind when you ask Him a question, then you know it is Him.
I heard Him just now for example as I asked Him what to say here, and I got this immediately.
Psalm 46:10
1 Kings 19:12