Here is a great quote from Dallas Willard:
One of the greatest fallacies of our faith, and actually one of the greatest acts of unbelief, is the thought that our spiritual acts and virtues need to be advertised to be known. The frantic efforts of religious personages and groups to advertise and certify themselves is a stunning revelation of their lack of substance and faith. . . .
Secrecy rightly practiced enables us to place our public relations department entirely in the hands of God, who lit our candles so we could be the light of the world, not so we could hide under a bushel (Matt. 5:14-16). We allow him to decide when our deeds will be known and when our light will be noticed.
Secrecy at its best teaches love and humility before God and others. And that love and humility encourages us to see our associates in the best possible light, even to the point of our hoping they will do better and appear better than us. It actually becomes possible for us to “do nothing out of selfish ambition or vain conceit, but in humility consider others better than ourselves,” as Philippians 2:3 advises. And what a relief that can be! If you want to experience the flow of love as never before, the next time you are in a competitive situation, pray that the others around you will be more outstanding, more praised, and more used of God than yourself. Really pull for them and rejoice for their successes. If Christians were universally to do this for each other, the earth would soon be filled with the knowledge of God’s glory. The discipline of secrecy can lead us into this sort of wonderful experience.