Buy a Heaven Blesses the Diligent calligraphy wall scroll here!
天道酬勤 can be interpreted in a few different ways:
God blesses those who work hard.
It is the way of Heaven to smile on the diligent.
God will reward those that are worthy.
Heaven blesses those who are diligent.
Whichever translation you like, a scroll like this on your wall may serve as a reminder to work hard because your diligence will pay off both in this life and the next.
Note: This can be pronounced in Korean, but it's not a commonly used term.