Hemsworth's tattoo is a continuation of the sentence on Cyrus' arm and can be put together as a full saying of the US former president.
The couple displayed the matching body art on Instagram, reported Ace Showbiz.
"Check out my tattoo," the "Hunger Games" star posted.
He displayed a picture of Cyrus' tattoo along with his.
The 'Hannah Montana' star's inking reads, "So that his place shall never be with those cold and timid souls who neither know victory nor defeat," while his says, "If he fails, at least fails while daring greatly."
This is not the 19-year-old actress' first tattoo. She also has two equal lines inked on her finger, which symbolized her support of gay marriage.
Her other tattoos include "LOVE" on her right ear, and a dream-catcher which is her biggest one tattooed on her ribcage.
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She also has an anchor inked on her wrist, "Just Breathe" written down under her breast, a heart on her little finger, "Love never dies" on her left arm, "VIIXCI" on her left elbow, as well as "BAD" carved in red ink on her middle finger.
The couple met on movie set of "The Last Song" in 2009. After several breakups and makeups, they were engaged on June 6 this year.