Simon's succinct Definition of " Truth" is excellent : " Truth survives the fire of intense scrutiny and critique and is both logically and factually accurate."
We have to add the caveat that "truth" is not Absolute, it is just possible that new Facts may emerge which modify, or very occasionally even overturn, what we previously thought of as "truth".
This is more so in our own time, because of the speed with which modern Science is making new discoveries.
But, if we really have subjected our "Truth" to the " fire of intense scrutiny" and that scrutiny has been carried out by Experts in the field which we are questioning, then we can be sure, if our "truth" survives this, that it will suffice at the present.
To not do this is to leave ourselves wide open to being manipulated, controlled and totally suckered by false claims, if our Education on things comes only from the MSM, and random people on the Internet, we are likely to be as ignorant and enslaved as we were as JW's by some different, but equally insidious nonsense.