There is no way to guarantee that everything that you think that you experience is not a lie sent by YHVH.
You may say, "YHVH does not lie."
To this, I say "2 Thessalonians 2:11 speaks about YHVH sending strong delusions upon people. What could be a stronger delusion than sending false revelations that you believe to be true about everything that you think is happening?"
You may say, "The whole passage is about YHVH sending strong delusions upon people who do not believe in him. YHVH does not send strong delusions upon people who believe in him for whatever reason."
To this, I say, "Matthew 19:26 says: But Jesus beheld them, and said unto them, With men this is impossible; but with God all things are possible. Matthew 19:26 does not say with God all things are possible except for sending strong delusions upon people who believe in him."
You may say, "Jesus said that he was the truth. Surely this means that those who believe in him will not be led astray by strong delusions from YHVH."
To this, I say, "Matthew 19:26 does not have Jesus saying that "with God all things are possible except for sending strong delusions upon people who believe in me as the truth.""
You may say, "As a non-Christian, you are incapable of interpreting the bible properly. I am a true Christian, guided by the Bible and YHVH's spirit, and my interpretation differs from yours in excluding the possibility of YHVH deceiving true Christians."
To this, I say, "Again, since YHVH is, according to the Bible, capable of doing anything, you are placing limits upon what YHVH can do."
You might say, "The Bible nowhere teaches that YHVH will send delusions upon true Christians."
To this, I say, "If YHVH were to reveal that he will send delusions upon true Christians, his deceptions would be more easily exposed. By not revealing that he will, he allows the deception to be stronger."
You might say, "Surely this sort of thing is so important that the Bible would reveal it."
To this I say, "The Bible does not reveal everything, even when it could. Take PI. 1 Kings 7:23 strongly suggests that PI = 3. There are those who say that this is not meant to be precise but an approximation, or that the value is explained by the measurements being based upon different portions of the rim, but regardless, this would have been an excellent place for YHVH to reveal that PI is certainly greater than 3, regardless of what the bowl's measurements might have been. But YHVH did not. This means that the Bible does not reveal everything, even when its revelation would be useful. How much more justified would concealing the fact that YHVH sends delusions upon true Christians be? To reveal such a thing outright, after all, would weaken YHVH's deceptive power."
You may say, "But the revelation that I feel seems exactly like the Bible defined true revelations."
To this I say, "Since all things are possible with YHVH, you cannot say that YHVH would not send false revelations to you that seem exactly like true revelations. What, after all would be a stronger delusion than a delusion that seems exactly like a true revelation from YHVH."
You may say, "Your argument depends upon logic, which depends upon YHVH's being real as Christians define him."
To this, I say, "For the sake of this latest question from you, let it be assumed that what you say is true. This is still no guarantee that YHVH is not sending false revelations to everyone. After all, since the bible say that "with god, all things are possible", this includes the possibility that YHVH is sending false revelations to everyone."
You may say, "I understand YHVH enough to know that he would never lie to me."
To this, I say, "The Bible says "Oh, the depth of the riches and wisdom and knowledge of God! How unsearchable are his judgments and how inscrutable his ways! "For who has known the mind of the Lord, or who has been his counselor?" (Rom. 11:33–34; cf. Job 42:1–6; Ps. 139:6, 17–18; 147:5; Isa. 57:15; 1 Cor. 2:10–11; 1 Tim. 6:13–16). By claiming to understand YHVH enough to know that he would never lie to you, you are claiming to be able to understand his ways and know his mind, which the Bible says is impossible. Besides, since, as the Bible says, everything is possible for God, this includes the possibility of doing something that is contrary to what people who understand him (or think that they understand him) think that he will do - including sending false revelations to true Christians that are so all-encompassing that everything that you think that you experience is a lie sent by YHVH."