皇天不负苦心人

Heaven will not disappoint the person who tries (idiom). If you try hard, you're bound to succeed eventually.

emperor / old variant of 惶[huang2]

day / sky / heaven

no; not so / (bound form) not; un-

to live up to

to bear / to carry (on one's back) / to turn one's back on / to be defeated / negative (math. etc)

bitter / hardship / pain / to suffer / to bring suffering to / painstakingly

painstaking effort / to take a lot of trouble / laborious at pains

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

person; people / CL:個|个[ge4],位[wei4]