Why is Jesus the first sacrament?

Jesus is the author of the Sacraments, their dispenser and the cause of their efficacy. He, however, is not properly a sacrament Himself, for a sacrament is a visible sign meant to confer grace when validly administered.

The phrase, "Jesus is the first sacrament" may refer to Jesus in the Holy Eucharist, for He is there truly present, Body, Blood, Soul and Divinity. The Holy Eucharist is not the first sacrament received, however, it is first among the others in its sublime excellence, for in it we really receive God and are in His Divine Presence. The Holy Eucharist also carries with it incredible graces.