Please Help Me

Date: 8/11/2016

Guys, I just saw something weird in my dream and remembered it very vividly. There was a man in my dream and he told me to follow him. I did what he told me to do and was led to sign that said "“Don’t tell me what’s possible and what’s not because if life itself is possible, then I can’t possibly imagine what could be impossible.” I don't know what this mean. I tried to google the quote, but with no lucks. Please help me find the person that wrote this quote. Thank You.