Your mind must be unnatural/altered to understand the spirit-God word

In etymology the word "Natural" is [adj] and means 1)  To produced by nature; not artificial of man-made. 2) Pertaining to or concerning psysical reality, as opposed to a spiritual, or imagined reality: natural science...such as biology, chemistry, or physics, based on the study of the physical world and its phenomena. 3) These sciences collectively. The opposite of all of those states of being is "Unnatural" and it means 1)  Ats or states violating natural law.  2)  Inconsistent with an individual pattern or custom. 3)  Deemed to deviate from a behavioral, ethical, or social norm: unnatural principles.   4)  Contrived or constrained: artificial: an unnatural manner.  5)  Outrageously violating natural or proper feelings: inhuman.  Given the clair cut contextual difference or in other words, the opposite setting natural position enemy to unnatural, I want a biblical scholar to explain why 1 Corinthians 2: 14 instructs people to bring their minds to be unnatural, or they will not understand the words or things of God because they are spiritually discerned. Tell us about this demand by Saint Paul, to be unnatural for spiritual elightenment.