The number one excuse I hear for not saving money is that everyone wants to wait until they have more. Well, with compound interest on your side, it is not a good enough reason.
Compound interest sounds incredibly boring but you don't really need to understand the dull formulas behind it. You just need to know it can have a magical effect on your long-term savings and you don't need to do anything to benefit from it. However, my Personal Finance test shows that it's not well understood.