“Parents are frequently inclined, because of a time-flattered sense of security, to take their children for granted. Nothing ever has happened, so nothing ever will happen. They see their children every day, and through the eyes of affection; and despite their natural charm and their own strong parental love, the children are apt to become not only commonplaces, but ineffably secure against evil. […] The astonishment of most parents at the sudden accidental revelation of evil in connection with any of their children is almost invariably pathetic. […] But it is possible. Very possible. Decidedly likely. Some, through lack of experience or understanding, or both, grow hard and bitter on the instant. They feel themselves astonishingly abased in the face of notable tenderness and sacrifice. Others collapse before the grave manifestation of the insecurity and uncertainty of life—the mystic chemistry of our being. Still others, taught roughly by life, or endowed with understanding or intuition, or both, see in this the latest manifestation of that incomprehensible chemistry which we call life and personality, and, knowing that it is quite vain to hope to gainsay it, save by greater subtlety, put the best face they can upon the matter and call a truce until they can think. We all know that life is unsolvable—we who think. The remainder imagine a vain thing, and are full of sound and fury signifying nothing.”

Pt. 1, Ch. 3
Christine (1983)

After his arrest, and getting dragged into court, quoted on The guardian, "Former Maldives president Mohamed Nasheed jailed for 13 years" http://www.theguardian.com/world/2015/mar/14/former-maldives-president-mohamed-nasheed-jailed-for-13-years, March 14, 2015.

Mrs. Arbuthnot http://books.google.com/books?id=RHkWAAAAYAAJ&q=%22Children+begin+by+loving+their+parents+after+a+time%22+%22they+judge+them+rarely+if+ever+do+they+forgive+them%22&pg=PA187#v=onepage, Act IV
A Woman of No Importance (1893)
Variant: Children begin by loving their parents; as they grow older they judge them; sometimes they forgive them.
Source: The Picture of Dorian Gray

Mazurek, Maria (7 July 2017): Cudowna armia, która broni naszego ciała http://plus.gazetakrakowska.pl/magazyn/a/cudowna-armia-ktora-broni-naszego-ciala,12271571. Gazeta Krakowska (in Polish), pp. 18–19.

"The Parent"; paraphrased variants:
Children aren't happy without something to ignore, and that's what parents were created for.
Parents were invented to make children happy by giving them something to ignore.
Happy Days (1933)

Source: Extremely Loud and Incredibly Close

Stories for Children (1984)