When you spend time with angels and time with God, you learn things, you are given things - some of which put you in very deep thought. But God gives you things and makes things aware to you that are otherwise not apparent to those who do not know God.
So what this means is that sometimes, when we talk about these things with others, we are left with claims that we cannot directly prove.
Christ was able to circumvent the brutal insults and condemnation this can cause - for a few years - by stuffing his claims inside of parables. One of which went something like, "What you put in your mouth cannot defile you, only what comes out of your mouth can defile you."
He otherwise would have struggled with telling a generation of Pharisee following Jewish folk that God does not actually care if you eat a porkchop sandwich, but God does care about you judging and condemning your neighbor.
It's like me telling a bunch of "the bible is the word of God" Christians that Christ doesn't care about people aborting a fetus or fags tounging each other down in a three-way.
A reasonable claim is, at best, plausible. And that is ALWAYS OK. A claim in and of itself should never be regarded as the complete and absolute truth - regardless of whoever is making the claim (on Earth or in heaven).
The only way one can consider a claim "the absolute truth" is to give authority to the one making the claim. Christ made a claim, "nothing you eat can defile you".
Now, one could say that Christ simply had the authority to make all foods clean; and the author of the gospel of Mark did just that by explicitly stating that Christ, "declared all foods clean".
What was not clear to the author of this gospel is that Christ was no authority, nor was he seeking authority, nor was he making a claim because of some supposed authority that a bunch of godless people attributed to him; he was simply sharing with a godless generation what he learned by watching God and by knowing and understanding the Kingdom/Garden of God - and that was 1) that God blesses whomever God wants to bless, regardless of what they eat, regardless of when they eat it; and 2) that the pursuit of justice and mercy and kindness, the pursuit of human decency, is for our sakes and not for God's.
Of course, Christ's claims meant nothing to most Pharisees: "you say it's OK to put whatever you want in your mouth, the bible says it's a sin".
But God is who God is - so Christ was never alone and God's mercy and power followed him wherever he went - proving Christ's claims to whomever God wanted to bless.
Christ made claims that were impossible for him to directly prove, but they were claims that would only be proven by God. A whole generation of Pharisees died and turned into dust, and Christ was given life eternal.
Claims from heaven are rare - and even then, should not be regarded as the absolute truth in and of themselves. Besides, not everyone flying above is a truth teller. Only a lying devil would assert authority and declare that their claims are truth enough.
One such claim given to me 15 or so years ago, which I couldn't grasp at the time, is that there is no separation between God and everything that exists - God is everything in everything.
Can heaven prove such a claim? Of course not. Only God can prove the truthiness of such a claim.
I have been able to observe. God speaks and interacts with us by way of the universe - from healing, to lessons, to eternal life, to wrath and judgment, to anguish, to death. God has no need for esoteric revelation, no need for spirits, no need to whisper things in people's ears.
How do you convince a blind infant that the sky is blue? You heal the infant's eyes. God is faithful, and understands the nature of an infant, and understands the nature of an infant's eyes.
