Verses To Interpret Christians: How Do You Interpret This 2 Verses?

Christians: How do you interpret this 2 verses? - verses to interpret

Mark 16:17-18 (New International Version)

17 And these signs will follow them that believe: In my name they will cast out demons, speak with new tongues; 18they pick up serpents, and if they drink deadly poison did not hurt at all, then put his hands on ill and will recover. "

It seems that should be common among the faithful is not it? where they can see in the world?