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. Where does your inspiration come from...
When you're feeling reflective?
Excited?
Does conversation yield ideas?
What state of mind are you in when feel inspired?
Experiencing life?
Does it occur spontaneously for you?
The best part of inspiration is that it has the power to transform your life in an instant.