Mediation is certainly helpful in increasing mind power. There are some other ways in which you can transform your thinking process and influence the mind, which results in better control. Applied quantum theory can also be taken in account when talking about self development. According to that school of thought we experience we think, reflect on, believe in, etc. – in every minute detail. There is much information available on the web about Quantum Wealth and Mind Power. Hope that link helps you out!