Boromir fell asleep one night on Caradhras listening to the Ring saying, 'I love you.' When he woke up, he believed it. Gandalf notices the Ring making a change on Boromir, and guides him to fight the One Ring's whispers. But when Gandalf falls, Boromir does not believe he can fight any longer.

"I merely wished to cleanse my mind. Have you ever dunked your head underwater, or been woken with a jug of ice water to your head? It clears a man's mind." Boromir of Gondor feels the Ring corrupting him, and wishes to rid his mind of its whispered words.