Small, faithful and subtle can things make a big impact over time. Take for example water. It can cut through mountains and forge rivers. You can also soak stuff in it to make it pliable.
Another great example is the mighty atom. Split it over and over and we have ginormous power.
A third is the power of small consistent habits.
I highly recommend the book Atomic Habits by James Clear.
Pondering Life : Pursuing God 