The effect of small changes over time

You’ll barely notice the effect of scarfing down ice cream tonight.  Do that tomorrow, and consistently over time, and get diabetes.  Practicing guitar (or swimming, or a foreign language) for 15 minutes a day won’t produce noticeable results the first week.  But 15 minutes per day is over 90 hours of concentrated practice over a one-year time frame.

Minor habits practiced consistently over time produce momentum, and lead to surprising outcomes.