John 10:7

(Hom. lix. 3) Our Lord, to waken the attention of the Jews, unfolds the meaning of what He has said; Then said Jesus unto them again, Verily, verily, I say unto you, I am the door of the sheep.

(ut sup.) Our Lord feedeth by plain words, exerciseth by obscure. For when two persons, one godly, the other ungodly, hear the words of the Gospel, and they happen to be such that neither can understand them; one says, What He saith is true and good, but we do not understand it: the other says, It is not worth attending to. The former, in faith, knocks, yea, and, if he continue to knock, it shall be opened unto him. The latter shall hear the words in Isaiah, If ye will not believe, surely ye shall not be established. (Isa. 7:9) (Tr. xlv. 8) Lo, the very door which He had shut up, He openeth; He is the Door: let us enter, and let us enter with joy.

Return then with me to what I was saying, in case it is so to be understood that we may both escape from the question. For I see how I, according to the catholic faith, may escape without tripping or stumbling; whilst thou, on the other hand, shut in on every side, art seeking a way of escape. See by what way thou hast entered. Perhaps thou hast not understood this that I said, See by what way thou hast entered: hear Himself saying, "I am the door." Not without cause, then, art thou seeking how thou mayest get out; and this only thou findest, that thou hast not entered by the door, but fell in over the wall. Therefore raise thyself up from thy fall how thou canst, and enter by the door, that thou mayest go in without stumbling, and go out without straying. Come by Christ, not bringing forward of thy own heart what thou mayest say; but what He shows, that speak.