2 Corinthians 6:17 Therefore " Come out from among them And be separate, says the Lord. Do not touch what is unclean, And I will receive you."
18 " I will be a Father to you, And you shall be My sons and daughters, Says the LORD Almighty."
When God's people have fellowship with the wicked, it influences them. A person can only learn so much, and that Christian is learning from the wrong source. But there really are good things you can learn from the world: how to read, how to drive, etc. However, the context of this verse shows that Paul is talking about pagan religions, and we are to have nothing to do with them or their wisdom.
When you lose the wisdom of the wicked, God gives you His own wisdom in its place. He promises that if we will separate, He will be a Father to us, instructing us in right and wrong.
To be continued...