Are "your" thoughts really just your own?

"...If we really develop this, we shall soon perceive that in the world  there is not only what we see, hear and perceive with our outer senses,  and combine with our intellect, but there is also an objective  thought-texture. Only few possess this to-day as their own innate  knowledge. This experience of a universal thought-tissue, in which the  soul actually exists, is not some kind of special occult experience; it  is something that any man can have if he develops the aforementioned  mood..." Rudolph Steiner:  Earthly Death and Cosmic Life: The Cosmic Thoughts and our Dead