St. Clement of Alexandria: It is the manner of life which shows up those who know the commandments...

'It is the manner of life which shows up those who know the commandments; for as a man's word is, so is his life.

The tree is known by its fruit, not by its blossom and leaves. Knowledge, then, comes from the fruit and from behaviour, not from talk and from blossom.'

St. Clement of Alexandria