Proverbs 2:6
For the LORD gives wisdom: out of His mouth comes knowledge and understanding.
We are all born with an inherent knowledge of good and evil thanks to Adam and Eve's decision to disobey God. "No" is one of the first words we learn to say after we learn our caregivers names, "Mama", "Dada", or in my son Brian's case, "Dani" (his sister). And we learn when to say 'No': when we want something we can't or shouldn't have and when we want to do something we should or shouldn't do. It's our nature.
The same logic is applied when we become born-again Christians. We learn what is good and what is evil. We learn to walk in the Spirit. We learn to talk in the Spirit. We learn to read God's Word with wisdom, knowledge and understanding. Especially when we have good leaders to lead us and guide us through God's Word; leaders we look up to and find ourselves following after.
As this verse in Proverbs 2:6 states, wisdom, knowledge and understanding come from God. And it is to God we must turn to in order to receive each one and apply them to our lives as His children. No longer are we under sin's command, now we are under God's command. And His command is love. Our new nature is very different from our old nature. Before, we always said 'No' and justified according to our desires. Now, we say 'Yes' and are justified by grace according to God's desires for us. We live in His love and can only grow and thrive in His love as long as we remain in His love, His Word.
Wisdom is Applied.
Knowledge is Gained.
Understanding is Growth.
Our new nature seeks after God in His Word and in prayer with Him; that's how we hear from Him. This new inherent nature is through Christ living in us: we are new creations in Him.
2 Corinthians 5:17 "Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new."
We are new creations in Christ when we believe that Jesus Christ is God's only begotten Son, that He died on the cross in our place, rose from the dead and walked out of the grave into newness of life and is seated at the right hand of the Father Hebrews 12:2 "Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God."