Rest in peace (acronym R.I.P.) in the second person singular, or “Requiescite in pace” in the second person plural. In the common phrase "Requiescat in pace" the "-at" ending is appropriate because the verb is a third-person singular present active subjunctive used in a hortative sense: "May he/she rest in peace." The phrase was first found on tombstones some time before the fifth century. It became ubiquitous on the tombs of Christians in the 18th century, and for High Church Anglicans, Methodists, as well as Roman Catholics in particular, it was a prayerful request that their soul should find peace in the afterlife.
A good day to die (phrase) an exclamation to draw attention, similar to a coach saying, "Let's do it!" It is likely neither Low Dog nor Crazy Horse ever said, "Today is a good day to die," which is the English bastardization of a common Sioux battle-cry, "Nake nula wauŋ welo!" ("nake nula waun"). This phrase means, "I am ready for whatever comes." It was meant to show the warriors were not afraid of the battle or dying in it. Another author describes it as the ending of a Lakota Sioux prayer. The 1993 film "Smoke Signals" plays with this concept: A good day to die