"For some the spell lasted only while the voice spoke to them, and when it spake to another they smiled, as men do who see through a juggler's trick while others gape at it. For many the sound of the voice alone was enough to hold them enthralled; but for those whom it conquered the spell endured when they were far away, and ever they heard that soft voice whispering and urging them.
"But none were unmoved; none rejected its pleas and its commands without an effort of mind and will, so long as its master had control of it."
That's from the second volume of Tolkien's "The Lord of the Rings" trilogy, The Two Towers: "The Voice of Saruman".
He's just warming up, the pleas and commands are yet to come...
Thank you