Randy Alcorn was interviewed on the subject of money and giving. In the audio clip, he shares about his book The Treasure Principle. 

I think of our lives in terms of a dot and a line, signifying two phases. Our present life on earth is the dot. It begins. It ends. It’s brief. 

I do in fact see Matthew 6 as certainly including, and actually even centering on, a promise for eternal rewards for the giving of money and possessions to the purposes of God.