When the Count saw my face, his eyes blazed with a sort of demoniac fury, and he suddenly made a grab at my throat. I drew away and his hand touched the string of beads which held the crucifix. It made an instant change in him, for the fury passed so quickly that I could hardly believe that it was ever there.

– Bram Stoker

Dracula, Chapter 2. When Jonathan cuts himself shaving, Dracula cannot resist his urge for fresh blood. He attempts to attack Jonathan and drink his blood. But Jonathan is saved by the crucifix, a holy object symbolizing good, which appears to repel the evil Dracula.