The word "truth" is loaded. Which is a pity, because the notion is pretty simple. Here's a simple proposition:

There is a world out there. This reality, universe, or whatever, is in some state or another, works in some way or another, and whatever we think about what it is or how it works has little bearing on what it actually is, or how it actually works. "Truth" then is merely an accurate depiction of our world (or parts thereof). The problem is ensuring accuracy, and that is impossible without infinite evidence. We can only approach certainty.

And there is indeed a point where we are certain enough, and further inquiry isn't worth the hassle.