1993 Jeep Cherokee laraedo 4.0

Sounds like you've already located the most obvious place to look for your no start - The arcing and sparking indicates a really bad connection at the starter solenoid, and now the clicking means that not enough electricity is making it to the solenoid to cause it to turn over. Disconnect the battery, then start at the starter solenoid, take the wire loose, then follow it back until you find the damage - it sounds like there are only a few strands left in the wire that are still connected. If you don't find ANY damage, post back, describe again the symptoms in as much detail as possible, and we'll start looking in a new direction. Good Luck!