Passion, ambition, motivation, inspiration, imagination and the desire for change will get you started.
Discipline, focus, patience, perseverance and a clear vision will help you to keep going.
The problem is that those two are almost the exact opposite.
And it's pretty rare to have both of them.
Which makes it so difficult for some people to get started and for others to be able to keep pushing.
But to be able to succeed you need both of them...