Which are you?

 The doubters said,
“Man cannot fly,”
The doers said,
“Maybe, but we’ll try,”
And finally soared
In the morning glow
While non-believers
Watched from below.

The doubters claimed
"The world was flat.
Ships plunged over its edge,
And that was that!"
Yet a brand new world
Some doers found,
And returned to prove
This planet round.

The doubters knew
"T'was fact, "Ofcourse,
No noisy gadget
Would e'er replace the horse."

Yet the carriages
Of doers, sans equine,
Came to traverse
All our roads in time.

But [to] those who kept saying
"It can't be done,"
Never are the victories
Or the honors won.
But rather,
By the beleving, doing kind,
While the doubters
Watched from far behind.

-Bruce Lee