The simplest thought, like the concept of the number one, has an elaborate logical underpinning.
The ancient saying, "There is nothing in the intellect which was not first in some way in the senses," and senses being explorers of the world, opens the way to knowledge.
All learning is derived from things previously known.
One can state, without exaggeration, that the observation of and the search for similarities and differences are the basis of all human knowledge.
Words are not the end of thought, they are where it begins.
We can only know in the nervous system what we have known in behavior first.
