to take a lot of trouble; to put in a lot of effort; to rack one's brains to accomplish something

to manage or build up an enterprise or project through immense effort and careful planning

to make extreme efforts to achieve something; specifically to study or work hard to reach a level of excellence that others cannot match

Heaven will not disappoint a person who tries their best; hard work is eventually rewarded

To rack one's brains; to exhaust one's thoughts and planning over a long period of time.