The leper was made clean because he entered into a living conversation with the Lord, engaged in heart, mind and voice with the living presence of the Divine Person Jesus Christ, Incarnate God, the source of life and healing.
In the Liturgy of the Word, "proclamation is primary". Putting aside distractions, we are called to be present in the same way as the leper was to the Lord who heals us of the alienation of sin, the loss of His presence through grace.
This we are able to walk away from our encounter with Him, as the leper did, rejoicing and proclaiming His Name and His presence, in the world and in us, through the grace of the Eucharist.
May God be praised.
(Art: Healing of the Lepers at Capernaum, Guérison des lépreux à Capernaum, James Tissot, French, 1836-1902, Brooklyn Museum of Art.)