The short answer is that scripture teaches it:
1 Corinthians 2:14
“The natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned.” (1 Cor 2:14)
A natural person, one born of flesh only, is incapable of understanding that which is spiritually understood. Salvation (repenting and believing the gospel) is a spiritual transaction that requires spiritual understanding, for which regeneration is an absolute requirement.
”For the mind that is set on the flesh is hostile to God, for it does not submit to God’s law; indeed, it cannot.8 Those who are in the flesh cannot please God.” (Rom 8:7-8)
A mind can be fleshly (carnal), spiritual, or in the case of believers, in whom sin still resides, BOTH carnal and spiritual. The unbeliever is controlled by…
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