In the Epistle to Titus it says in chapter 1 verse 12 and 13 "One of the Cretans, a prophet of their own, said, 'Cretans are always liars'". This is called a logical paradox since if a member of a group says that all members of the group are liars we can't know if what he says is true since he must also be a liar. Students of logic think about this and try to find an answer. The one who said this was Epimenides, so it is named for him.