This quote means that the key to your success lies in the activities you do each day. It is important to have a plan for what you will do each day, and to stick to it. This plan should include tasks that will help you reach your goals. For example, if your goal is to start a business, then you should allocate a certain amount of time each day to researching the market, finding potential customers and investors, creating a plan of action, and networking with other entrepreneurs. If you consistently focus on these activities, you are likely to achieve your goal.