For long-term investors, understanding what can and cannot be controlled is the key to financial success and peace of mind. While all investors would like to believe they can predict or even control the market's direction, experience teaches us that this is difficult. Constructing and risk managing an appropriate portfolio, while making strategic and tactical allocations based on market opportunities, ideally with the guidance of a trusted advisor, is often the best approach. However, while following markets and maintaining a perspective on the economy is essential, an even more fundamental key to success is investing early, investing often, and remaining focused on long-term financial goals. What can investors do to benefit from these principles today?