When someone says you can't, look at where they are sitting. Perhaps they meant they can't.

“At a trade show, someone said, "You'll get in trouble for that." I replied,"Are…”

“Don't tell me about your effort. Show me your results.”

“Let's dispel a little myth. Working hard is NOT the key to success. It may be a…”

“Ignore failure. Try anew until you succeed.”