“Now we have received not the spirit of the world, but the Spirit who is from God, that we might understand the things freely given us by God” (v12). Paul used “spiritual” to mean people who have been given new life by God’s Spirit, and “natural” to mean those who remain dead in their sins. Those who follow the world’s ways (the “natural”) reject “the things of the Spirit of God” (v14) because God’s ways seem like “folly” to them. Once God’s love invades our hearts, His ways make more sense.
“But we have the mind of Christ” (v16). Amazingly, as Jesus dwells in us by the Spirit, He helps our minds and hearts to be shaped more like His.