We'll just see about that

It is written that George Chaffey "viewed the wastes known as the Cucamonga Desert and decided that this patch of land, if properly watered, could become productive and profitable."

I am sure he was not the first person who looked at the Cucamonga Desert and thought
of this. What is the difference between dreamers and doers? Mentors tell us that we
should work for our dreams. But a lot of people pass on their dreams and opt for a more
comfortable life. It is tough to step out of our comfort zone and live the life that we are
truly destined to live. Few of us go after our dreams. To be a dreamer is not enough.
We have to be doers.

If you are told that you can't do something, just reply, "we'll just see about that."