Staying motivated is one of the most challenging parts of personal and professional development. To be able to stay motivated even in tough times, understanding how your brain works is a must. Specifically, do not be afraid to take big leaps, visualize success, do not stress yourself out too much, and look at difficult situations as opportunities to help others and help yourself grow. Once you have fully understood how your brain works, mastering your own life and achieving greater things will become a lot easier.
Source: https://www.lifehack.org/900026/reward-system-in-brain