Beda Venerabilis
In everything we do in this life, the future recompense is already contained. The apostle says the same thing, that recompense is the fruit of our present actions: "Whatever a man sows, that he will also reap" (Gal 6:7).
It is rightly said that the fruit of righteousness is sown in peace by those who make peace.
The fruit of righteousness is eternal life, which appears as the recompense for righteous works. Those who seek peace follow after that very peace toward which they strive.
They cast the finest seeds into the soil of their hearts. These seeds sprout, watered by daily good deeds, and bring forth the fruit of heavenly life.
Evil people also sow and reap, and at the judgment they receive according to their merits. Yet they reap not fruit, but corruption.
They partake not of the eternal good things that we here call fruit, but of the destruction and corruption in which they lived their earthly life. Now they receive the eternal torments of recompense.