Name and Preaching
Nikon's mission was defined by a single insistent theme. He is recorded as opening his sermons with the call to repentance — rendered in the tradition as "Repent, for the Kingdom of Heaven is at hand" — and from his habitual use of the Greek imperative "Metanoeite" ("Repent") he received the name by which he is still known.
His preaching took him across a wide span of the Byzantine world. The sources trace his travels through Asia Minor and Armenia, across Crete after its liberation from Arab rule, and on through the Greek islands of Euboea and Aegina into the Peloponnese. The synaxarion records that he healed the sick and performed many miracles in the course of this itinerant ministry.