I agree with you that if you combine the power of your mind with consistent positive action that you've got an unbeatable power to achieve your goals. For me, mind power is a combination of our conscious and subconscious minds. It's the subconscious mind that is the "bigger" partner. Ie. it controls over 90% of our thoughts and actions. Therefore, you have to make sure that your subconscious mind is in harmony with your conscious mind. So you need to believe what it is you are thinking. So, for me, mind power means having your conscious and subconscious mind in alignment in order to create the life you want.