Some of the roots of role-playing games (RPGs) are grounded in clinical and academic role assumption and role-playing exercises.
Gary GygaxThere's a call to adventure. It's something in the inner psyche of humanity, particularly males.
Gary GygaxAs a typically ambitious player, I did what all others of that ilk do: Everything I could do to gain advantage for my PCs and rise in level as rapidly as possible.
Gary GygaxYou are not entering this world in the usual manner, for you are setting forth to be a Dungeon Master. Certainly there are stout fighters, mighty magic-users, wily thieves, and courageous clerics who will make their mark in the magical lands of D&D adventure. You however, are above even the greatest of these, for as DM you are to become the Shaper of the Cosmos. It is you who will give form and content to the all the universe. You will breathe life into the stillness, giving meaning and purpose to all the actions which are to follow.
Gary Gygax