It probably would have helped if I was more specific with the quotes, but do to my lack of a LOTR book at the moment, I found those from another thread
here...
If I recall correctly, the 1st LOTR one Gandalf tells Frodo in
The Shadow of the Past.
The 2nd one is Galadriel in
The Mirror of Galadriel.
But don't hold me to that.