"A Jedi sufficiently strong in the Force can be trained to produce a facsimile, but not true Sith lightning, which, unabated, has the power not only to incapacitate or kill, but to physically transform the victim. Force lightning requires strength of a sort only a Sith can command because we accept consequence and reject compassion. To do so requires a thirst for power that is not easily satisfied. The Force tries to resist the callings of ravenous spirits; therefore it must be broken and made a beast of burden. It must be made to answer one's will. But the Force cannot be treated deferentially. In order to summon and use lightning properly, you will someday have to be on the receiving end of its power, as a means of taking the energy inside yourself."
â€•Darth Plagueis http://starwars.wikia.com/wiki/Force_lightning
Hope is the denial of reality. It is the carrot dangled before the draft horse to keep him plodding along in a vain attempt to reach it. We should remove the carrot and walk forward with our eyes open. -- Raistlin Majere