Oswald Chambers wrote,
The true character of the loveliness that speaks for God is always unnoticed by the one possessing that quality. Conscious influence is prideful and unchristian. If I wonder if I am being of any use to God, I instantly lose the beauty and the freshness of the touch of the Lord. “He who believes in Me…out of his heart will flow rivers of living water” (John 7:38). And if I examine the outflow, I lose the touch of the Lord.
Who are the people who have influenced us most? Certainly not the ones who thought they did, but those who did not have even the slightest idea that they were influencing us. In the Christian life, godly influence is never conscious of itself. If we are conscious of our influence, it ceases to have the genuine loveliness which is characteristic of the touch of Jesus. We always know when Jesus is at work because He produces in the commonplace something that is inspiring. (http://utmost.org/the-ministry-of-the-unnoticed/)