There’s probably no way of knowing, really.
That is, any truth you may encounter has to be perceived (seen, felt, smelled, tasted), and the filtration of that perception through your senses and interpretation by your mind will be different for you than it is for anyone else. Then if you try to describe what you perceive as truth, then your words and others’ ability to hear, comprehend and interpret what you say makes it even less likely that others will understand more than a fraction of what you say.
So, let’s say that there’s a God, and that It is an Absolute Truth.
Who can experience that, comprehend it, make sense of it and understand it… and then tell anyone in a way that makes any sense?
Maybe there is Absolute Truth in the world; the best we can do is hopeful approximations, estimates, models, allegories and stories to try to understand it… if it’s even there.
“The sky is blue” is not an Absolute Truth. What’s blue? What’s the sky? Go high enough, and the sky is black.