What are some proverbs/sayings about something small turning into something big, spiraling out of control, like a snowball effect?

Looking especially for Greek proverbs but they don’t have to be. Everything I’ve found is positive (something bad turning into something good) but I want it to be about a small thing that you do and brush off that later leads to enormous consequences (kind of like an unhealthy addiction)


Don't let very small sins turn into very bad habits. ~Saint Teresa of Avila Interesting how the saint considered bad habits to be worse than sins. But she always was a bit of a rebel.


Just remember that the mighty oak was once a nut like you.


Oh no, I am so constipated right now?