Master Your Mind
Your mind is your greatest resource. A super computer sitting on your shoulders. The power of the universe lives between your ears. Regardless of how much of the brain we actually use, we could always use more, there's no doubt about it. Do we have the willpower to use more? The desire to use more? The knowledge that we can use more? The evidence that using more will make a positive impact?
You are the master of your mind; the captain of your ship. Pay special attention to what you let into your head - both internal and external messages. Feed your brain a healthy diet of positive energy. This will require sacrifices such as cutting off negative energy sources (media, drugs, friends, family, etc). This will cause personal growth that will need nurturing and care. Build a fence around your mind garden and keep the pests out because they exist to tear you down and hold you back.
With a healthy mind you will be able to freely create, give, share, accomplish and contribute at the highest level. Do what you must to master your mind daily. Be conscious and find a support system. Your mind is a powerful tool. You can be its slave or its master. Dominate your mind. Make it bend to your will to serve you, then use all that power to serve others.