Look at the Ramban in Parashas Acharei on vechai bohem in great detail. People get a reward as the purpose for doing mitzvos. If one dioes mitzvos to do well this world, he gets rewarded this world and one next world, will be rewarded next world. If for no reward, will be rewarded both words, as he will not be swayed by it. The hachana, preparation for doing mitzvos is rewarded in this world.
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