They are two different Latin expressions. Carpe diem belongs to the 11 Horace Ode. The full verse says: carpe diem, quam minimum credulous postero: take advantage of the day, the future is uncertain. Although the literary background of Horacio epicureista, the expression there is no an invitation explicit to the pleasure, as if it happened in the Renaissance. Both in the middle ages and the Baroque and romanticism the referent is the transience of life, which is also repeated in the other expression: memento mori: remember that you must die, whose probable origin is in the Roman custom to say it to the generals who were victorious in Rome. But according to the testimony of Tertullian, the slave said to the victorious general was: Respice post te! Hominem te memento esse!: looks back! Remember that you are a man ( and not a God ).
