He took him off by himself away from the crowd.
He put his finger into the man’s ears and, spitting, touched his tongue;
then he looked up to heaven and groaned, and said to him,
“Ephphatha!” (that is, “Be opened!”)
And immediately the man’s ears were opened,
his speech impediment was removed, and he spoke plainly.
-- Mk 7:31-37
Signs taken up by Christ. In his preaching the Lord Jesus often makes use of the signs of creation to make known the mysteries of the Kingdom of God. He performs healings and illustrates his preaching with physical signs or symbolic gestures. He gives new meaning to the deeds and signs of the Old Covenant, above all to the Exodus and the Passover, for he himself is the meaning of all these signs.
-- CCC 1151