With accent marks:
Вода́ ка́мень то́чит.
Water wears away a stone.
Even if you act with little effort but constantly and persistently, you can achieve a lot.
The English equivalents of this Russian proverb are: Little strokes fell great oaks, Drop by drop the sea is drained, Water dripping day by day wears the hardest rock away, Water breaks down a mountain.
Other Russian proverbs
Make a fool pray to God - he will break his forehead.
Do not dig a hole for another one, you will fall into it yourself.
A bad example is contagious.
A titmouse in hands is better than a crane in the sky.
Do not chop the branch you sit on
In a quiet whirlpool, demons live.
Fear has big eyes.
The apple never falls far from the tree.