Inspiration refers to an unconscious burst of creativity in a literary, musical, or other artistic endeavour. It has it's origins in both Hellenism and Hebraism. The Greeks believed that inspiration or "enthusiasm" came from the muses, as well as the gods Apollo and Dionysus. Similarly, in the Ancient Norse religions, inspiration derives from the gods, such as Odin. Inspiration is also a divine matter in Hebrew poetics. In the Book of Amos the prophet speaks of being overwhelmed by God's voice and compelled to speak. In Christianity, inspiration is a gift of the Holy Spirit.