"Apostle John the Theologian"
by A.N. Mironov
Gospel of John 13.34-35
The blessed John the Evangelist lived in Ephesus until old age. His disciples could barely carry him to church and he could not muster the voice to speak many words. During individual gatherings he usually said nothing but, "Little children, love one another."
The disciples and brothers in attendance, annoyed because they always heard the same words, finally said, "Teacher, why do you always say this?"
He replied with a line worthy of John: "Because it is the Lord's commandment and if it alone is kept, it is sufficient."
Jerome (AD 347- 420)
Fathers of the Church, Commentary on Galatians 6.10, Andrew Cain Jerome, CUA Press, 2010