they swear their strongest oaths by allah that if a sign came to them by it they would believe. say certainly signs are in the power of allah but what will make you realise that if signs came they will not believe.?
وأقسموا بالله جهد أيمانهم لئن جاءتهم آية ليؤمنن بها قل إنما الآيات عند الله وما يشعركم أنها إذا جاءت لا يؤمنون