True words indeed. Anything worth doing will first draw ridicule, then as you ignore the mockery, it will graduate to anger. But if you stick to your guns and fight for what you believe in and keep working at it, eventually, you win!
Don't be dismayed if you are at the laughing stage, everyone laughed at Arnold Schwarzenegger when he said he declared his Hollywood dreams, but that did not stop him from surpassing all expectations. Most great achievers have been laughed at one stage or another. The thing is, once you win, the laughter stops.
It doesn't matter how big your goal is and how impossible they say your dream is. Remember:
“Impossible is just a big word thrown around by small men who find it easier to live in the world they've been given than to explore the power they have to change it. Impossible is not a fact. It's an opinion. Impossible is not a declaration. It's a dare. Impossible is potential. Impossible is temporary. Impossible is nothing.” ― Adidas Advert
I encourage you today to accept that your goal can be achieved. Start now by writing it down, do your research to understand what it will require of you, then break it into small attainable steps and focus on doing these. Most of all, start, and don't let the laughing, or the fighting stop you.