Homily - "I will pour out My Spirit on all flesh" - charisms today

We have a lot of people experience charisms.  There is always a need for a prudent discernment as St. Paul and St. John say.  

Our Lord God has sovereign freedom.  He can whatever, whenever, with whomever He wants.   Scripture is FULL of examples of this, but we often think it is weird.  What does St. Paul say about these experiences?  What does the Catechism say about this?