A GOOD ASKING

This mosaic of St Ephrem is the oldest image I could find: an 11C mosaic from the Nea Moni monastery 
on the Greek island of Chios. He looks as if he has just seen the ghost of Mani threatening him. 

I was looking up the 4th-century St Ephrem of Syria, nicknamed "the harp of the Holy Spirit" for his Syriac hymns, and came across "the Prayer of St Ephrem" which is part of the Orthodox liturgy and which I found simple and touching:

O Lord and Master of my life, give me not the spirit of idleness, meddling, lust for power and idle talk.

But grant unto me, Thy servant, a spirit of wisdom, humility, patience and love.

Truly, Lord and King, grant me to see mine own faults and not to judge my brother. For blessed art Thou, world without end. Amen.

The "wisdom" in the second line is sophrosunè in Greek, which is a kind of general intelligent sanity of life: it is traditionally translated as "chastity" but in modern terms something like "wisdom, discernment, integrity, simplicity" and/or a mixture of all of those seems more accurate.