Hard work pays off and this is a fact. If you work many long hours at your job for example and save your money, you can use it later on to pay for something. Down the road, you won't have to worry about not having money to buy food or to treat yourself to nice clothes. After having worked hard, you are at ease of knowing that you can afford certain things which your hard work has been able to buy you. Another example, you can save your money for a nice vacation or a new mobile device.
Hard work does not necessarily have to do with money. You can work hard in school for instance. You can spend many hours studying all semester long to acquire the knowledge necessary to be able to ace an exam. Your hard work of studying can be paid off when you receive your final grade. You can earn an A or an A+ in your final grade as a result of all the hard dedication to the exam.