Booklet, Storing Up Treasures In Heaven, Ryuho Okawa, English

The essential point is whether or not your fortune produces positive value.
That positive value will come back to you in the form of virtue in the other world.

The more you use this expanding wealth, the happier you, as well as the people around you, will become. This will lead to infinite progress and living in this infinite progress is the way to attain true happiness.