...Then show me! Lecture me again when you are on the verge of death!
Garland is a boss in Final Fantasy IX, fought at Pandemonium.
He is a mage and knows the devastating Flare move. Garland is vulnerable to Silence, Darkness, and Slow. He has a slow reaction time, and is not particularly difficult.
It is a good idea to inflict at least one status effect on him. Any combination of Zidane and Steiner's physical attacks, Vivi's Black Magic, Eiko or Dagger's White Magic, and Quina's Blue Magic should be enough to defeat Garland.