The disciples ask Jesus about what the signs will be when God's Kingdom comes. Jesus replied 'This wicked evil generation, they ask for a sign and no sign will be given., except Jonas in the belly of a whale."
Evil asks for a sign because they are the ones who have to be proven to, even by God. They will live in darkness as if in the belly of a whale.
That is half the truth. The other half is:
When you start to take signs, you will find them all around you. Amen?