omne ignotum pro magnifico est
Latin quotation from Tacitus
om·ne ig·no·tum pro mag·ni·fi·co est ˌȯm-ne-ig-ˈnō-ˌtu̇m-prō-mäg-ˈni-fi-ˌkō-est 
: everything unknown is taken as grand : we exaggerate the importance or difficulty of the unknown