The famous quotes that come to mind from (grass and trees) are:

1. Will is law - John Wilson.

2. Will controls things - Virgil.

3. The power of will is greater than the power of hands - Sophocles.

4. Only with a strong will can you have a great life - Britain.

5. Hardship can temper one's will - Thomas Brown.

6. If you want to make a difference, then go on firmly. Retreating will only weaken your will. - Luo Herrick.

7. Will leads people to a smooth road, sorrow leads people into a maze - E. Spencer.

8. Cultivating will is the goal of our existence - love and sacrifice.

9. A strong-willed person can put the world in his hands and knead it like a lump of clay - Goethe.

10. Having a firm will is like adding a pair of wings to your feet - Joe Bailey.