“As long as we try to project from the relative and conditioned to the absolute and unconditioned, we shall keep the pendulum swinging between dogmatism and skepticism. The only way to stop this increasingly tiresome pendulum swing is to change our conception of what philosophy is good for. But that is not something which will be accomplished by a few neat arguments. It will be accomplished, if it ever is, by a long, slow process of cultural change – that is to say, of change in common sense, changes in the intuitions available for being pumped up by philosophical arguments.”

Anarchist Morality http://dwardmac.pitzer.edu/anarchist_Archives/kropotkin/AM/anarchist_moralitytc.html (1890)
Context: The history of human thought recalls the swinging of a pendulum which takes centuries to swing. After a long period of slumber comes a moment of awakening. Then thought frees herself from the chains with which those interested — rulers, lawyers, clerics — have carefully enwound her.
She shatters the chains. She subjects to severe criticism all that has been taught her, and lays bare the emptiness of the religious political, legal, and social prejudices amid which she has vegetated. She starts research in new paths, enriches our knowledge with new discoveries, creates new sciences.
But the inveterate enemies of thought — the government, the lawgiver, and the priest — soon recover from their defeat. By degrees they gather together their scattered forces, and remodel their faith and their code of laws to adapt them to the new needs.

The Writings in Prose and Verse of Eugene Field: The love affairs of a Bibliomaniac (1896), Ch. IV : The Mania of Collecting Seizes Me, p. 44
Context: Human thought is like a monstrous pendulum: it keeps swinging from one extreme to the other. Within the compass of five generations we find the Puritan first an uncompromising believer in demonology and magic, and then a scoffer at everything involving the play of fancy.

Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe], (1998), Quotations from "Tales of Power" (Chapter 10)

Source: Life of Pi

Song lyrics, The Kick Inside (1978)