[Tip Of My Tongue] Need help finding a specific issue

Firstly, I'd like to apologize for the minimal information in this post.

A year ago, I was reading through lots of Batman comics that my friend had lent me. I remember this one issue in which Batman is training in the mountains with a master who keeps quoting a Chinese philosopher. I remember that one quote that really hit me hard, but I can't remember the quote at all now. I kinda remember it being Lao Tzu... but searching for that didn't bring up anything on Google.

So I've been at this for a year and I can't sift through hundreds of comics again, to look for it... but I will, if you guys can't help me out.

I really wanna find this guys. What better place to ask, than this sub? Thanks in advance! I hope I find it here.