Found it.

I've been saying this many, many times both to myself and to others, but it seems that I've just understood the full meaning of it: Open up that mind. Close your mind, and you're the one who'll lose out on things. 

Yes, I'm having my traces of regrets here. I know that the past is the only thing that brings to us today, sure, but well - being human, there are things that you wish you'd do it differently. I'm saying that I've just understood something, but the possibility of re-discovering it in the future is never zero.

I don't know how to break or tunnel through the fifth wall, at least, yet, so I shall just imagine these bits of words could be a wish for my future self, and a faint signal to my past self. "Don't lose sight on that confidence that you love. Always."