Today, Jesus shows us the testimony as the essential mission of all Christians: «So let your light shine upon others» (Mt 5:16). This light will come to us out of satiating us with the Gospels and being inflamed by the Holy Spirit. Jesus also tells us that we must be salt: "You are the salt of the Earth" (Mt 5:13). What is the salt supposed to be for? Mainly for two things: to give savor to the meals and, in those days, also to keep food. The Lord wants us to give the taste of the divine grace to our world that needs it so much while preserving good manners in our society, a good coexistence, justice and respect for the value and dignity of all human lives.

At all times there have been people who have seriously taken the call of God, and the saint whose memory we venerate today, Justin (2nd century), is one of them. In Christian ancient times, he was salt and light; at the same time he was one of the first secular saints of the Church. Intrinsically, a philosopher and researcher, he found in the Christian faith a reason for his life and the answer to his questions, as he himself stated before the prefect of Rome Rusticus in the process that led to his martyrdom: "I have endeavored to learn all doctrines, but I have acquiesced at last in the true doctrines, those namely of the Christians". Pope Francis says in his "Lumen Fidei": «Those who believe, see; they see with a light that illumines their entire journey, for it comes from the risen Christ, the morning star which never sets».

While he was a student of philosophy and theology, Justin was also one of the early popularizers and exhibitors of the Christian doctrine; we owe him the first detailed revelation of the Sunday Eucharist and its rites.