Translation check

Hello! I'm planning to get a tattoo and would really appreciate a scholarly review before I commit. I'm looking for a Quenya sentence inspired by Albert Camus' quote "In the midst of winter, I found there was, within me, an invincible spring." The proposed Quenya is: Mi hrívë hirnen i mi nin ëa tuilë láfíra. My intention is: "In winter, I found that within me there is an unfading spring." Is this grammatical using attested Quenya only, or would you suggest any improvements? Thank you!