Sin's Deception

A strong place and wonderful was Isengard, and long it had been beautiful; and there great lords had dwelt, the wardens of Gondor upon the West, and wise men that watched the stars. But slowly Saruman had shaped it to his shifting purposes, and made it better, as he thought, being deceived--for all those arts and subtle devices, for which he forsook his former wisdom, and which fondly he imagined were his own, came but from Mordor; so that what he made was naught, only a little copy, a child's model or a slave's flattery, of that vast fortress, armoury, prison, furnace of great power, Barad-dur, the Dark Tower, which suffered no rival, and laughed at flattery, biding its time, secure in its pride and its immeasurable strength.

--J. R. R. Tolkien, The Two Towers (Houghton Mifflin), 542