What is this font called ?

Probably not what you want to hear but please don't get a tattoo like that. Isn't the point of a tattoo to express yourself as an individual but about 90% of people with a writing tattoo get that ugly cursive faux-classy font and it's so cliche.

Another idea don't get writing at all, unless it actually truly means something to you. Make sure you really think it through, don't get someone's name or a hackneyed phrase or something similarly trite. If you want to remember a saying all the time, just write it on some paper, don't engrave any bullshit permenantly into your skin

That ain't a font. For example, look at the difference in styles of writing 'r' in the picture.

Though you can get similar matches if you search for script fonts on dafont.com

MS Stoic Script Large, not the exact name but it looks exactly like that.