Google the name Prometheus, and see how often it has been given to innovations in many different fields, notably science, medicine and space exploration. The fire he stole can be seen, too, as the spark generating all artistic creativity.
At times our own light goes out and is rekindled by a spark from another person. Each of us has cause to think with deep gratitude of those who have lighted the flame within us.
To cement a new friendship, especially between foreigners or persons of a different social world, a spark with which both were secretly charged must fly from person to person, and cut across the accidents of place and time.
Goal-getting matters. And writing down the brave acts and bold dreams you intend to accomplish will provide the spark to get them done.
I believe a lot of our lives are spent asleep, and what I've been trying to do is hold on to those moments when a little spark cuts through the fog and nudges you.