Kingdom Rewards

In chapter 6 of the Sermon on the Mount, Jesus talks about three common religious acts: prayer, giving, and fasting. Since many world religions also perform these acts, how does being a citizen of God's Kingdom impact the way we do them? And what how do we respond when God's promise of reward doesn't seem to be true?

“And when you fast, do not look gloomy like the hypocrites, for they disfigure their faces that their fasting may be seen by others. Truly, I say to you, they have received their reward. But when you fast, anoint your head and wash your face, that your fasting may not be seen by others but by your Father who is in secret. And your Father who sees in secret will reward you.

- Matthew 6:16-18