FileFront Forums - Book of the Five Spheres

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While relatively little is known about Rhetoricus and the Book of the Five Spheres, it is known that the work constituted his magnum opus and was composed near the end of his life, "some long centuries before" the 41st millennium. Among the Chapter, Rhetoricus is considered second only to Rogal Dorn in knowledge of war, making the tome among the most authoritative texts of the Imperial Fists.
The work deals with a wide array of content and includes subjects ranging from meditation to a comprehensive appraisal of the strengths and limitations of all the weapons in an arsenal of the Adeptus Astartes. Concerning the latter, Rheotircus considered the sword the most perfect close-combat weapon devised by man, without which an Imperial Fist rarely steps onto the field of battle.
In introducing the canonical work to aspirants, Captain Taelos says that "in the estimation of most within the Chapter, it was not until Rhetoricus codified the Rites of Battle that the accumulated wisdom of our noble traditions was finally distilled into one text. In the sacred pages of The Book of Five Spheres did Rhetoricus record all that he knew of weapons and war

The soul of the Imperial Fist can be found in his sword."
"When the odds are innumerable against you, and there is little hope of victory, still a holy warrior with a sword in his hand can prevail, if his intent is righteous and pure."
"Pain is the wine of communion with heroes." (this statement is also included within the "Liturgy of Pain," recited while Neophytes are lowered into the Pain Glove aboard the Phalanx:
"Pain is a lesson that the universe teaches us.
Pain is the preserver from injury.
Pain perpetuates our lives.
Pain is the healing, purifying scalpel of our souls.
Pain is the wine of communion with heroes.
Pain is the alembic which transmutes mere mortal into immortal."
"The craftsman, in his work, must comprehend measurements and design, and have a mastery of each of the tools at his disposal. In the same way, the warrior must comprehend tactics and strategy, and master each of the weapons in his arsenal."
"The wise warrior plans out his actions meticulously."
"When fighting another human, you must become your opponent. Put yourself in your opponent’s place, and think from his point of view."
"The Emperor commands us. Dorn guides us. Honour shields us. Fear our Name, for it is vengeance."
"Do we bemoan such losses? No! We are the Fists! We do not need to hibernate or spit venom. We crush our enemies!
Rhetoricus teaches to adopt an aggressive attitude with one's body while maintaining a passive attitude with the blade, in order to draw one's opponent into making the first move.
Rhetoricus teaches to always look into the eyes of the opponent when dueling, rather than at their blade or body; the eyes will betray everything one needs to know about the opponent's movements