Whenever the mind consciousness worries, fears, or feels vexed for no reason, it all comes from the manas. Because it arises for no reason, the mind consciousness does not know why the manas has these emotions, whereas it can know the causes belonging to the mind consciousness itself. The emotions vented by the mind consciousness all have causes, because the mind consciousness can introspect itself, can analyze and deliberate, and thus knows why it itself gets angry and has emotions; but it is not easy to observe and analyze the emotions of the manas.
When the mind consciousness cannot analyze or deliberate yet still gets angry or feels vexed, that all comes from the manas—it is the manas directing the mind consciousness to vent emotions. For example, upon waking in the morning, when one has not come into contact with anything at all, one inexplicably feels unwell, feels distressed inside, and wants to lose one's temper—all of that comes from the thoughts and emotions of the manas. The mind consciousness does not know what the manas is thinking, but the manas will inevitably drive the mind consciousness to vent these thoughts and emotions.
Many emotions that for a time cannot be clearly explained or articulated all come from the manas; even emotions that the mind consciousness keeps trying to control but cannot control all come from the manas. By observing in this way, one can gradually distinguish between the mind consciousness and the manas. If the mind consciousness knows that something is not good and feels somewhat worried, but the mind consciousness then rationally analyzes and concludes that it is nothing, yet the heart still keeps worrying, or worries more and more—what is going on here? This is that the manas has been made worried. The mind consciousness says it is nothing, but the manas does not yet understand or comprehend, and so it will continue to worry incessantly.
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