William Blake. (2024, January 23). Wikiquote. Retrieved September 12, 2024 from https://en.wikiquote.org/w/index.php?title=William_Blake&oldid=3451810.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/works/w/william-blake/the-marriage-of-heaven-and-hell/quotes/without-contraries-there-is-no-progression.md
Dmitry Peskov (Wikipedia) Dmitry Sergeyevich Peskov (Russian: Дмитрий Сергеевич Песков, IPA: [pʲɪˈskof]; born 17 October 1967) is a Russian diplomat and the press secretary for Russian president Vladimir Putin.