It is just like English sayings and phrases, there are Japanese sayings and phrases as well. It is called [kotowaza ことわざ].
石の上にも三年・Ishi no ue nimo san nen (Three years on the stone)
Even if a stone is cold, if you patiently sit down on it for 3 years, the stone will get warm.
Ishi – a stone
Ue – a top
San nen – three years
The is a teaching. No matter how hard it is if you continue making an effort, it will surely pay off at the end.
Perseverance prevails.／Patience wins / Slow and steady wins the race.
How to use it
Chugakusei ni natta ani wa sakka bu ni haitta. Renshu wa mainichi taihen sou daga, ichi no ue nimo sannnen, reguraa ni naru to ganbatte iru.
My older brother who became a junior high school student, has joined the football club. The practice seems to be hard everyday but three years on a stone, he is doing his best to become a regular player.