1 They who have been taught to believe “In One God the Father Almighty,” ought also to believe in His Only-begotten Son. For he that denies the Son, the same has not the Father. I am the Door, says Jesus; no one comes unto the Father but through Me. For if you deny the Door, the knowledge concerning the Father is shut off from you. No man knows the father, save the Son, and he to whomsoever the Son shall reveal Him. For if you deny Him who reveals, you remain in ignorance. There is a sentence in the Gospels, saying, He that believes not on the Son, shall not see life; but the wrath of God abides on him. For the Father has indignation when the Only-begotten Son is set at nought. For it is grievous to a king that merely his soldier should be dishonoured; and when one of his nobler officers or friends is dishonoured, then his anger is greatly increased: but if any should do despite to the king's only-begotten son himself, who shall appease the father's indignation on behalf of his only-begotten son?
Source: Catechetical Lectures (New Advent)