This is the best of Joel S. Goldsmith's books I've read so far. On the other hand, I suspect that that the others I've read have been equally good, it is just that my understanding has grown a little, so I appreciate this one more.
The author teaches us that in order to heal anyone we shouldn't think of the person or problem to be healed, but just sit and focus on all the attributes of God we can think of, then take a listening attitude. Then we will get a sign that healing has occurred, for example, a feeling of peace or a sense of inner release. Though we may have to practice for some time until we are able to reach the point where we get a sign, and healing occurs.
There is only one power - the power of the spirit. All disease and lack are in essence non-existent, a nothingness. When you see a mirage in the desert, you just get into your car and drive through it, since you know it doesn't exist This is the way you must heal disease or lack - just continue as though they don't exist - which they don't.
One of Goldsmith's basic messages is that as long as we believe in the two powers, good and evil, we will have periods of good and periods of evil. Disease is healed by our lifting our consciousness up to the Divine and praying "Thy will be done in me, not mine."
In my opinion, this is an essential book. Reading a few pages of this book (or probably any book by this author) will help you integrate more and more these basic teachings.
I highly recommend this book.