"I am the gate."

"Whoever enters through me will be saved,
and will come in and go out and find pasture.
A thief comes only to steal and slaughter and destroy;
I came so that they might have life and have it more abundantly."

-- Jn 10:1-10

"The Church is, accordingly, a sheepfold, the sole and necessary gateway to which is Christ. It is also the flock of which God himself foretold that he would be the shepherd, and whose sheep, even though governed by human shepherds, are unfailingly nourished and led by Christ himself, the Good Shepherd and Prince of Shepherds, who gave his life for his sheep.

-- CCC 754

Communion of the sacraments. "The fruit of all the sacraments belongs to all the faithful. All the sacraments are sacred links uniting the faithful with one another and binding them to Jesus Christ, and above all Baptism, the gate by which we enter into the Church. The communion of saints must be understood as the communion of the sacraments. . . . The name 'communion' can be applied to all of them, for they unite us to God. . . . But this name is better suited to the Eucharist than to any other, because it is primarily the Eucharist that brings this communion about."

-- CCC 950