Quotes from book
It

It is a 1986 horror novel by American author Stephen King. It was his 22nd book, and his 17th novel written under his own name. The story follows the experiences of seven children as they are terrorized by an evil entity that exploits the fears of its victims to disguise itself while hunting its prey. "It" primarily appears in the form of Pennywise the Dancing Clown to attract its preferred prey of young children.

Source: It (1986), Ch. 16 : Eddie's Bad Break, §8
Context: Maybe, he thought, there aren't any such things as good friends or bad friends — maybe there are just friends, people who stand by you when you're hurt and who help you feel not so lonely. Maybe they're always worth being scared for, and hoping for, and living for. Maybe worth dying for, too, if that's what has to be. No good friends. No bad friends. Only people you want, need to be with; people who build their houses in your heart.

“Eddie discovered one of his childhood's great truths. Grownups are the real monsters, he thought.”
Variant: And almost idly, in a kind of sidethought, Eddie discovered one of his childhood's great truths. Grownups are the real monsters, he thought.
Source: It (1986)