Thanks for pointing me in the right direction. Here is what I found... but the words aren't coming up just right. Maybe it was my aunt's interpretation of them that I'm remembering.

John 17:15 I do not pray that You should take them out of the world, but that You should keep them from the evil one.

What I remember my aunt saying is "I have prepared them to go into the world, yet they are not of this world. (They have been set apart.)"

Jesus was speaking of the disciples' sanctification through Jesus' own sanctification.