The sum total of all thoughts or conditioning is the mind or the ego. A thought basically splits the inner consciousness into two or more parts. Then each and every part gets into a fight or an argument with the other. This is the constant chattering of the mind. Even when one is silent on the outside the inner chattering is continuosly functioning.
Yoga means a union of all the broken parts of the consciousness.
For example, consciousness can be thought of as a beautiful still pond. Thoughts would be like throwing stones into the pond. Still ponds can make a beautiful reflection. However, when disturbed there are several broken up reflections. When no stones are thrown into the pond there are no ripples caused.