A stone is ingrained with geological and historical memories.
The origin of each of our ideas. Quote: Andy Goldsworthy.
Leave no stone unturned.
To do everything you can to achieve a good result, especially when looking for something.
Those who remove mountains begin by carrying away small stones.
Moving an enormous mountain is something impossible to do. However, moving individual rocks might take a lot of time but is completely easy to do.
Constant dripping wears the stone.
Means that persistence will achieve a difficult objective.