Regarding the fallen Knight: they will never understand this...

Gremlin philosophy: Whoever comes to us with a sword is easier to shoot :D (Taken from K/I WarCraftIII)

Dwarf philosophy: Many years ago we were imprisoned in ice... The time has come to pay! Our chief will lead us to the glory of the lord of snows!

Ghost philosophy: Peace... For hundreds of years we have not remembered what that is. Necromancer summoned us from the world of the dead. However, it is the only thing we crave... Peace... But Necromancer summoned us from the world of the dead, disturbing our... peace... Someday, we shall find... peace... again... when the Necromancer become one of us! Hahahahaha... peace...

P.S. Involuntarily, I end up writing as if a ghost or dwarf himself is telling you about the way of life of his kin, which slightly distorts the image of a philosophical statement. Please bear with me.