At last, at last, once again someone speaks in Greek out of a fresh inward experience of life. That experience is his faith, which makes him sure of his hope. His glowing love embraces all mankind: to bring them salvation he joyfully sacrifices his own life, yet the fresh life of the soul springs up wherever he goes. He writes his letters as a substitute for his personal activity. This epistolary style is Paul, Paul himself and no other.
U. von Wilamowitz-Moellendorff (Berlin, 1912)
As Quoted in FF Bruce’s “A Mind For What Matters” (collected essays)