A Shining Countenance
Ecclesiastes 8:1 Who is as the wise man? and who knoweth the interpretation of a thing? a man's wisdom maketh his face to shine, and the boldness of his face shall be changed.
When you are confident in your capabilities to get any job done successfully, then without any conscious effort on your part, your countenance will reflect your confidence. Speaking without words to those around you that the task at hand will be accomplished with excellence.
Hebrews 10:35-36
35 Cast not away therefore your confidence, which hath great recompence of reward.
36 For ye have need of patience, that, after ye have done the will of God, ye might receive the promise.