Without fire the centers of the organism cannot be refined.

https://im42na.wordpress.com/2013/01/25/booth-diary-missing-pages/
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48.  To co-measure one's actions with the actions of co-workers is also a fiery quality.  When lighting a lamp no one intends to set fire to the house; on the contrary everyone seeks a safe place for a lamp.  Fieriness is not madness.  It is awful to listen frequently to ignorant conversations about the chaotic state of fire.  It must be understood that this element demands the highest co-measurement, profound circumspection and caution.  Each agni yogi is primarily wise in the apportionment of this substance.  He will be thrifty rather than extravagant.  As a faithful guardian he knows that the highest substance is purified through lofty labor and suffering.  He knows that each energy of fire is like a rare blessing.    -Morya:  Fiery World 1933
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262.  Fire is required for tempering the best blades.  Without fire the centers of the organism cannot be refined.   Inflammation of the centers is unavoidable, but one needs only to be very careful during such periods.    

                                       -Morya:  Brotherhood 1937
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                                              Afra dictation:
                         https://www.youtube.com/watch?v=JzvfL_vFiWA