Saint Romuald lived over 1,000 years ago. He is venerated today in both the Catholic and Eastern Orthodox traditions.
A couple of quotes from the short link below:
Empty yourself completely and sit waiting.
Sit in your cell as in paradise. Put the whole world behind you and forget it. Watch your thoughts like a good fisherman watching for fish. The path you must follow is in the Psalms — never leave it.
I tend to see religions and beliefs as something like languages. Much of it is vocabulary and context.
I bet Romuald and Milarepa would have gotten along well and understood each other well.