The U.S. first billionaire said once in an interview:

Yes, I tithe, and I would like to tell you how it all came about. I had to begin work as a small boy to help support my mother. My first wages amounted to $1.50 per week. The first week after I went to work, I took the $1.50 home to my mother and she held the money in her lap and explained to me that she would be happy if I would give a tenth of it to the Lord.
I did, and from that week until this day I have tithed every dollar God has entrusted to me. And I want to say, if I had not tithed the first dollar I made I would not have tithed the first million dollars I made. Tell your readers to train the children to tithe, and they will grow up to be faithful stewards of the Lord.
— John D. Rockefeller, Sr.

Tan, P. L. (1996). Encyclopedia of 7700 Illustrations: Signs of the Times. Garland, TX

He began tithing even as a child, and became one of the richest men in the history of mankind through the business of petroleum. He came from a poor family and an absent father. But his mother taught him to put down a root of faithfulness, which still today brings prosperity to the Rockefeller family (his fortune when he died in 1937 was US$ 760 billion, adjusted to today’s rates. This is more than 12 times the wealth of Bill Gates). 

Being faithful upon little is a test of character. Before giving much to someone, you test that person’s character by observing how he or she behaves when in charge of little.

Just as God gave oil to Rockefeller, He wants to give sources of wealth to His children. There are many treasures yet to be discovered, millionaire ideas, opportunities… Of course, God is hoping to find faithful and diligent servants whom He can give them to, before they fall into other hands…