If something (science for example) is only true at the time… was it ever really true to begin with? The Bible is absolute truth because it doesn’t change.
Look at it this way: It is true that there is big rock in my front yard. If I move the rock, it is not true that there is a big rock in my front yard. Was it ever true to begin with? Yes.
If the sun goes "red giant" was it ever true it was a average yellow star?
Processes are different. We can have an incomplete picture, but provisionally think we have an understanding. Consider the following admittedly imperfect example.
Suppose you observe a sequence of numbers. Your observation starts with "3, 5". Ah, the sequence is of odd numbers. You observe "7". Ah, confirmation. Then "11". Oops, all the numbers are odd. Still true, but our examination of reality is yet incomplete. The sequence skipped an odd number, but they are also all primes! And the missing number wasn't! Maybe that's the sequence. Then "15". Nuts. Well maybe the sequence counting by 2s and now they are counting by 4s and we should evaluate whether the pattern changes and does it change consistently. We don't know how long before the "3" the sequence started. If 3 was the first in line for counting by 2 AND counting pattern changes every 3 then the next number will NOT be "19"...at least if the pattern of changes in the pattern doesn't change. So, we could guess 21 if we guess that pattern change is 2, 4, 6. However, if it is 2, 4, 2, then the next number will be 17. If the number IS 19, then perhaps we were counting by 2s longer than what we observed. And so on.
At each stage we observed the data. We adopted a model (counting by odds). We made a prediction (7). We made an observation. It was correct. So we make a new prediction (9). It was wrong. We modified our model (count off the primes). Etc.
At each stage our observations about the data were correct -- in so far as we can tell -- at no point in my example did the numbers become even. When we switched to primes, all the numbers
were in fact prime. However, the subsequent prediction of 13 (the next prime) was wrong since what we observed 15. We skipped a prime
and the next number was
not prime. BUT, the numbers were still all odd. AND, they will stay odd
unless the pattern of pattern changes changes. And so on.
We know what we know when we know it. We can make predictions and do make predictions. This may confirm or disconfirm our model. We adjust accordingly. And that is my example of science and how things are true until they aren't.