An a priori decision to eliminate spiritual intelligence from consideration is no more justifiable than a decision to admit it by fiat or on faith. After all, once one includes the understanding of the personal realm within a study of intelligence, such human proclivities as the spiritual must legitimately be considered. There certainly are no easy grounds for a decision, but several other intelligences deal with phenomena other than sheer physical matter. If the abstract realm of mathematics constitutes a reasonable area of intelligence (and few would challenge that judgment), why not the abstract realm of the spiritual?

p. 51 - Intelligence reframed: Multiple intelligences for the 21st century, 1999