I get the sense that in your thinking, an object is not Source/Spirit, a person or event may or may not be Spirit, a quality may or may not be Spirit - and that is, indeed, what the culture teaches us. But what Emma Hopkins and Emilie Cady understood is that it's ALL ONE SPIRIT/SOURCE/SUBSTANCE. Every thing, person, experience, or quality we perceive is our brain-limited version of Spirit showing up for us. So, they're telling us, when we name anything, any person, any state of being, any feeling as our Good, we are naming Spirit, and by naming Spirit in that form, we are inviting Spirit to take that form in our perceptions.
When Hopkins and Cady encourage us to acknowledge the good and claim it for ourselves they are offering a way of experiencing all that we call good by identifying all that we call good and ourselves as the same thing -- Spirit, the Source, the underlying power and intelligence of all that is. They say that we can have it without feeling required to DO anything to achieve or experience it. We identify with that experience, that physical form, that quality, and because we ARE it already (for we could not wish, desire, or imagine it if we weren't), we then begin to perceive it in our lives. We no longer seek it, because we realize we ARE it, and the form that is here and now is Spirit in expression - so it is Good. The lamp is Good, the food is Good, the body is Good, the person over there is Good, their healed body is Good...I name it Good to get out of the habit of naming things as not okay and reinforce my understanding that all is Spirit/Source/Substance taking whatever form I call good, that all I perceive is what I have thought and felt before now, and is my very loving, cooperative Spirit Self showing up as my world for me.