While that is true, you'll want to work on doing it "right" before you do it passionately. Learn the rules for how to sing classically well as much as you can; then you can bend and break those rules for the sake of a better performance.
One of the biggest things with singing is breath control, as Chili mentioned. (But no one's elaborated yet, so I'll do that here.)
If you don't have enough air, your vocals won't sound good. You'll run out of breath halfway through lines; notes will be flat; etc. etc. It's like if you're playing an electric guitar, and the power to your amplifier cuts out halfway through each riff. It's just not going to work!
You want to do most of your breathing from your diaphragm. When you inhale, you want your gut to expand, not your chest. Breathing with your chest gets you small bursts of air very quickly, while breathing with your stomach nets a larger amount of air but a little more slowly. With singing, you want sustained air pressure for a long period of time, so breathing from your gut is the way to go.
Breathe in with your stomach, and then push the air back out with your stomach as you sing. Your core (abs and other lower torso) is in general a much stronger part of your body than your throat. The more work your gut can do, the less your throat will be strained.