Our thinking is molded by our “mind” (3820). Perhaps the KJV gets it better with “heart”, which is the most frequent translation of the word in both versions. This is one of the great truths dealing with our salvation and why it is of grace rather than works. God works His miracle on our inner man. Our hearts are cleansed. Our being is redeemed and our minds are transformed. It is not something we can bring about by our actions.
I believe in free will so I understand this to mean that
(1Jn 1:9 KJV) If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.So? If we have confessed and been forgiven then our inner man is in a condition to move forward in our understanding of things eternal. Otherwise they make no sense.