The Spark seems to be separate from every other single facet of a spark's brain or personality. We have seen insane sparks and, well, not-so-insane sparks. We've seen smart sparks and dumb sparks. Sparks can be well-intentioned or cruel. Education seems to play a part -- smarter sparks have a better chance of survival. We've also gotten hints that correct fostering, encouragement of their abilities and ambitions, can determine whether or not one successfully breaks through.