The sphinx Isperia is the current guildmaster of the Azorius. The process of convincing Isperia to lead the guild took years, as sphinxes are aloof beings who value solitude above all. As crime and chaos on Ravnica increased in the absence of the Guildpact, however, and as its denizens more vocally demanded laws and their enforcement, Isperia decided her service was needed enough to trump her own preferences.
"I serve only justice. But through that duty, I serve all of Ravnica."
"The rules of logic and order have already made the choice for you." -Isperia (Azorius Charm)
"The higher the mind soars, the greater its understanding of the law." -Isperia (Azorius Keyrune)
"I've dreamt of the future, Isperia. Danger is on the horizon. You must heed my warning." (Sphinx of the Chimes)
"The prohibition of unnecessary tossing of the citizenry by giants shall also extend to spontaneous giants." -Isperia's Edict, provision VII.789.2 (Giant Growth)
"The Selesnya are gathering armies. Do you still believe they aren't preparing for war?" -Teysa, to Isperia (Horncaller's Chant)
"Learn not only from the failures of the past, but also its triumphs." (Accumulated Knowledge)