No, I'm asking how we know that authors of the original texts were being honest.
Ah, alright. Well, let me frame it in this sense: let's imagine that they
were all lying, the disciples, the apostles, every single person involved in composing and contributing to the Gospels and the New Testament. Spiritually, in knowing that they are lying about a guy being the Son of God, they'd therefore be at the understanding that they're going to hell for this, but that there, then, must be some reward on Earth worth making such a big lie over, since hell is eventual, but maybe they'll get some joy out of this heresy in the meantime, something worth deceiving the masses for. So, what reward do they get on Earth, then, that this heretical thought must be worth? Could it be abundant glory, riches, women, land, fame? Maybe if they deceive enough people, they could have palaces of concubines, or a vast empire, all to be ruled amongst themselves together! No. They get persecuted and driven out from town to town, locked up in deep dungeons, stoned to death, beheaded, flayed alive, burnt to death, crucified, clubbed to death, one had rope bound to his neck as a horse dragged him through streets of cobblestone, another burnt with hot plates and stabbed with spears, another hanged upon the branch of an olive tree, the list continues. Does this sound like the type of plan that people would be so willing to spend their lives for, without any resistance to the ruling authorities oppressing them, for these people truly believed that those who die for The Lord are blessed with eternal life, and that, even as they were so gruesomely killed, that they would inhabit a place alongside The Lord in the hereafter? My response, then, is: why
would they, the early Christians, the original followers of Christ, lie and deceive to the point of the most unimaginable human pain when they could have, at any moment, packed up and given up on their lie? Why would they have written these historical accounts if they knew what would come to them? Why would they report and spread news of all of these miracles of Christ, following Him as He healed and blessed, when they knew it would have the authorities on their tail, desperate for a justification to slay them all? Clearly, then, at least in my eyes, it's very blatant that something divine is going on here, for something so peculiar to occur that so many would sacrifice their whole existence just to praise what must be a random, false prophet, right? Well, no, He wasn't any false prophet, He was the Son of God, as proven to me, and hopefully, eventually, with your own study, to you, through the documentations of His own miracles, through the hundreds of Messianic prophecies fulfilled by Him, and through the sheer determination and willpower His first followers showed to the world with their acts of courage and bravery in the face of the severest oppression one could encounter in their time.