What does it mean to be "driven"

I think it means to have your thoughts and actions completely focused on your goal, and in whatever you have to do in order for you to accomplish that goal.

And what does it mean to have a "bigger vision"?

mmm perhaps its about being able to see yourself and your live after you have accomplished the goal you are trying to accomplish right now, of course, goals change over time, but being able picture yourself in the future might be considered to have a "bigger vision"?

Or maybe its about doing projects that change the world? but that sounds too generic.

And...at what cost?

This is important, sometimes we sacrifice soo much when working towards our goals that we don't realize everything we are sacrificing, especially when it comes to time.

But the cost willing to be paid depends on the person, and the importance of the goal