The law of accumulation, according to author Brian Tracy, says:

"... that everything great and worthwhile in human life is an accumulation of hundreds and sometimes thousands of tiny efforts and sacrifices that nobody ever sees or appreciates. It says that everything accumulates over time. That you have to put in many, many, many tiny efforts that nobody sees or appreciates before you achieve anything worthwhile. It's like a snowball. A snowball starts very small, but it grows as it adds millions and millions of tiny snowflakes and continues to grow as it gathers momentum."

"Everything worthwhile happens one step at a time"

See: logistic curve -- fractal --