I think you need to refer to the original post. No one here gave you that translation.
viewtopic.php?f=28&t=6906There were a number of different options. It's always a good idea to take time and double, triple, quadruple check before you get inked.
Here's a breakdown of what Labhrás gave you in that post, the third one being the closest to what you have. I agreed with his options as any of those would work.
Éiríonn pian i neart. = Pain becomes strength. (lit.: Pain rises into strength)
Déanann neart den phian. = Pain becomes strength. (lit.: Strength makes [itself] from the pain)
Leis an phian a thagann an neart. = With pain comes strength. (lit: [it is] with the pain that comes the strength)
Both
éirigh i (rise into) and
déan de (make from) have the meaning "become"
and perhaps
tar i (come into), too:
Tagann pian i neart. = Pain becomes strength. (lit.: Pain comes into strength)