In a dialectical world such as ours, there are a plethora of rival interpretations.
What are we to believe?
Fortunately, there are very few reasonable interpretations and in general just one most reasonable interpretation.
In addition, NO interpretation -no matter how reasonable it sounds- that does not fit ALL of the data is in any way, shape, or form reasonable.
So the problem is not so difficult after all.
And one of reasonable interpretations is usually correct, and if the person doing the reasoning is good (has good scientific instincts), his/her most reasonable interpretation is usually correct.
Occasionally, an interpretation considered unreasonable turns out to be correct. Follow the data trail – ALL OF THE DATA – and you will find the best interpretation, even when it looked unreasonable.