No they're not. This "New Thought" of Della's is just as amorphous as New Age is.
IOW, it's spiritual fluff. Lots of oxymorons, and "duhs" ("We live in truth".. what the hell is that supposed to mean?).
I presume the meat is coming.
No, New Thought has some very concrete principles. They're similar to the principles taught by Tony Robbins, Steven Covey, Wayne Dyer, and the movie "What the Bleep Do We Know?"
The basic idea is that how we think creates the reality in which we live. "As a man thinketh, so is he." "It is done unto you as you believe."
"Change your thinking, change your life" is one of teh key principles of New Thought. It is a philosophy of prosperity ("It is the Father's good pleasure to give you the Kingdom") and spiritual healing. Many people find it very empowering.