Whereas Western canon law regarding hermits has been marked until recently by an extreme rigidity, Eastern monasticism is distinguished in this, as in other respects, by flexibility and variety. … Such matters cannot and should not be made the subject of detailed legislation; freedom must be left to the conscience of the individual, guided by the Holy Spirit and by his spiritual father. Canon law should not displace the personal relationship between the abba and his disciple.
Metropolitan Kallistos in Solitude and Communion: Papers on the Hermit Life