These people managed to achieve great triumphs. Their fortunes are measured in billions, and their names appear on the Forbes Billionaires list. And they managed to achieve it all thanks to their infinite perseverance and never-ending love of work.

Here are their recommendations for whenever you or someone you know needs some inspiration. Whether you are cramming for an exam, preparing a great speech about why you should get a promotion, or simply down in the dumps, Enlighten is sure that their advice will be useful.