-Word vain as used in Matthew 6:7, vain repetitious prayer.

-virtue:.Barnes New Testament Notes."the original word.(Greek).is not as limited in its signification as the English word is, but is rather a word which denotes a good quality or excellence of any kind. In the ancient classics it is used to denote manliness, vigour, courage, valour, fortitude and the word would rather denote energy or power of some kind, than what we commonly understand by virtue..."

Adam Clarke's Commentary by Gary Gallant."It is certain that the word 'areth', which we translate virtue or courage, is used.(1Peter 2:9).to express the perfection of the Divine nature:."...that you may show forth the virtues or perfections of him who has called you from darkness into his marvellous light."

"But there is a various reading here which is of considerable importance and which, from the authorities by which it is supported, appears to be genuine 'through the knowledge of him who has called us by his own glory and power.(Greek "tou kalesantov hmav idia doxh kai areth").or by his own glorious power. This is the reading of Adam Clarke, several others and in effect, of the Coptic, Armenian, Syriac, Æthiopic, Vulgate, Cyril, Cassiodorus."