What are some famous quotes starting with If?

Answer 1

If opportunity doesn't knock, build a door

Answer 2

1. "If you can't fly then run, if you can't run then walk, if you can't walk then crawl, but whatever you do you have to keep moving forward." - Martin Luther King Jr.

2. "If you want to shine like sun, first you have to burn like it." - A.P.J. Abdul Kalam

3. "If you can dream it, you can do it." - Walt Disney