As Christians, we have the Spirit from God living in us, departing the wisdom of God on us. 1 Corinthians 2:6-14 explains that we have this Spirit that allows us to understand the things of God that the wisdom of this world fines foolish. If the world understood the wisdom of God, Jesus would never have been crucified. This understanding, what God prepared for us, was revealed to us through the Spirit.
Verse 11 says, "For who knows a person's thoughts except the spirit of that person, which is in him? So also no one comprehends the thoughts of God except the Spirit of the God." Christians have received the Spirit which is from God to understand the things freely given us by God. The things of God are folly to the natural person, but are understood and judged by the spiritual person. But the spiritual person can not be judged because no one can understand the mind of the Lord or instruct Him. These are bold statements about believing in God and in the hope of salvation that comes from the faith in Christ. Although the world may think of the cross and salvation as foolishness, the believers have nothing to fear, because God has designed this truth for us and saved us. No one but the elect can look at our faith and judge. This is not to say they won't make some sort of judgement against us, but their judgement is invalid and meaningless in all reality. We are saved by the one true God, who can not be judged by anyone created.