39 Holy Paladins are a extremely good healing class. They do not generally run out of mana quickly, unless hit with a spell such as mana burn or viper sting. They can have large crit heals, good flash heals, critical strikes can regenerate mana, instant heals, 100% critical strikes with heals (with talent), are generally interruptable, and have many invulnerability shield spells, also called "bubbles".