Motivated reasoning means reasoning to gain. Speaking to effect means speaking to cause something.
Both are the most common forms of thought and speech for all people with few exceptions.
Speaking to effect and motivated reasoning maintain personas.
Because it is difficult to tell truths and because trying to do so brings calamity, we don’t. We narrow thought instead; our voices dull faceless muffled sounds with no meaning.
This is the tone and timbre of samsara, the feeling of group delusion, the Suffering of the First Noble Truth.