Jesus repeatedly used the words "in secret" in describing spiritual practices like praying, giving and fasting. How against man's natural tendency that is. But along with the "in secret" was the word reward. So as you put off your natural tendency to let people know how spiritual you are and put on letting God's grace flow through you God's way, there will be a reward for you. Think about it, you can get praise of men now, or you can have God's reward for eternity.
The next thing that caught my attention was at the end of verse 24:
You cannot serve God and wealth.
Beth Warlick, 1/7/2009