What is virtue?
1. Excellence. The word “moral” used in the New American Standard translation does not occur in the Greek. The word arete, which can be translated “virtue,” refers to the demonstration of power, in this case to the filling of the Holy Spirit. This is the same word used in verse 3 for the function of divine excellence. To the faith with which we begin the Christian life, we have to supply the power of the Spirit of God, that means we have to know how to be—and stay—filled by means of the Holy Spirit.
Source: The Basics The Basics -- printed page 159
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