* Stay focused: Don't get distracted by other things.
* Stay determined: Don't give up easily.
* Believe in yourself: Keep thinking about what you want to achieve.
Here are some equivalent expressions:
* Stay on task
* Don't give up
* Be persistent
* Focus on the goal
* Keep at it
The phrase emphasizes the importance of mental effort in achieving a goal, suggesting that success often hinges on maintaining concentration and motivation.