They are both real, and both illusions. Realism and idealism are not diametrically opposed, a realistic manifestation of the ideal in the physical world is the issue. Both planets reflect the illusion of dis-empowerment. The person may be given to fears about inadequacy, and believe in the impossibility of dreams being true. Faith is lacking.
Spirit interferes with matter and vice-versa.
The early Christian movement was based on this mistrust and belief. Hence, judgment was rampant. When these planets are conjunct, one planet can overwhelm or invalidate the other. The identity can develop an inferiority complex through the inability to balance these different worlds of alternatives. If the conjunction is well aspected, there are high ethical standards, and a logical or practical approach to religion.