Albert Einstein is often quoted as saying that "compound interest is the eighth wonder of the world." While there is some debate about whether he actually said this, the sentiment reflects the profound impact compound interest can have over time. 

Einstein's observation highlights how compound interest allows savings and investments to grow exponentially rather than linearly. When interest is added to the principal amount, and subsequent interest is calculated on this larger amount, the growth can become substantial over long periods.

This principle is crucial in finance, as it illustrates the importance of starting to save and invest early to take advantage of the power of compounding. Over time, even small amounts can grow into significant sums if they benefit from compounding interest. This understanding underscores the value of patience and long-term thinking in wealth accumulation.