Tradition
St. Augustine
Sermons on Selected Lessons of the New Testament
Sermon 78
[CXXVIII. Ben.]
On the words of the Gospel, John 5:31 ,“If I bear witness of myself,” etc.; and on the words of the apostle, Galatians 5:16 , “Walk by the spirit, and you shall not fulfil the lust of the flesh. For the flesh lusts,” etc.
Source: Sermons on Selected Lessons of the New Testament (New Advent)