Permission is usually granted, and that too by someone else. However there are times, when you feel strongly to doing something that you believe in that you need to grant yourself permission. No other person can truly understand your passion and your beliefs, even if you have communicated to them countlessly, but yourself. So do yourself a favour and grant yourself that permission to do whatever it is that you strongly believe in. Whatever the outcome might be, you have done it with faith. And faith, even when it is turns out wrong, will only serve to make one stronger.