Everything we write and say is just speculations based upon our own knowledge and experiences. We cannot say more than what our knowledge and experience have equipped us with to use when explaining concepts.

Therefore, the truth should be ever changing for each person.

Facts are rather simple. Things you can measure and are unchanging. Things like colors and weight when on the Earth, etc.

Speculation does not mean untrue. It can still be true to the best of each of our knowledge. We can't talk about things we are unaware of or lack sufficient knowledge of. So it is still true to us. When we tell people the truth, we tell them what we believe.

Which is not the same as a fact.

Though when we are explaining anything we cannot repeat, measure, etc then it is always a speculation of sorts. We just tend to have a very high FAITH in it being as close to a fact as we can get based upon what probability has revealed to us.

If it is true all but 1 time in a million, it is still not the complete TRUTH of that reality. The model for our understanding of it simply has a very high probability of returning the correct answer. That's the best we can have, until we discover new knowledge and can provide a model with an even smaller margin of error.

You won't convince me of your absolute truth. I don't view you as a God.

I'll always view it as your current best understanding as to which of your speculations made the most sense to match observations and experiences you have had.