The ultimate tautology is that reason is reasonable. The sensual world and whatever extensions of those senses we can manage are the exclusive realm of scientific thought. It cannot acknowledge anything beyond our ability to sense and extrapolate. That is the limit of scientific endeavor.

I just love the first sentence. However scientific thought can be applied to any data set, because in addition to material replicability it also uses imagination and analytic skills of several kinds. And it can (in the right mind) be used to find new ways to acquire data and then test and evaluate the data so acquired. Phenomenological data is not, strictly speaking, part of the sensual world in any shared sense of the word. There is no sure way to know if one perception of intense affection is just like another's even though they both say it is love.:D

But there are ways to group and compare such data.

A