Prayer done in secret leads to success.
…pray to your Father who is in secret. And your Father who sees in secret will reward you (Matthew 6:6).
The first reward is being closer to the Father. From that flows renewed spiritual awareness and strength. A further reward is the truth that God really hears and acts upon such prayers. If we want to be more spiritual, and be more effective for good, here is the right place to start. Follow the example of Jesus in making more time and place for praying in secret!
To sum up, private prayer will help each of us to have:
purer motivation,
better concentration,
freer expression,
answered requests,
and a more personal relationship with God.