From the WoW game guide for paladins: "These holy warriors are equipped with plate armor so they can confront the toughest of foes, and the blessing of the Light allows them to heal wounds and, in some cases, even restore life to the dead.
From the WoW game guide for priests: "Walking the line between Shadow and Light, Priests heal allies with powerful holy magic and sling sinister spells in tandem
Post first war paladins were created from priests (clerics) who needed to train as warriors
From WoWWiki on paladins: "The paladin is a "warrior of the Holy Light".
"Empowered by the Light, these mighty warriors brandished both their warhammers and holy fire in the battle against all those who would trample the weak and innocent.
Yeah I'm the clueless one.