I want to translate the quote into a tattoo.

"Pain teaches us who we are." Someone help please? Preferably in Quenya or Sindarin.

It is recommended by most to not translate with Neo-Elvish and to take the original text and transcribe it with Tengwar. This is due to what we know about Neo-Elvish may change when new information comes out.

Something like this would have to be paraphrased, and it might loose it's original meaning.