When sense faculties and sense objects come into contact, consciousness arises. The interaction of sense faculties, sense objects, and consciousness produces contact, whereby consciousness cognizes the realm of mental objects (dharmas), and the mental faculty (manas) relies on this to make overall decisions. Consciousness and the mental faculty necessarily interact and mutually perceive each other's mental states; only then can the dharmas continue to operate, enabling the activities of body, speech, and mind to occur. If consciousness and the mental faculty do not interact, consciousness cannot function, its birth would serve no purpose, and the mental faculty would never again choose to allow consciousness to arise in the future. The very purpose of consciousness arising is to cooperate with and submit to the needs of the mental faculty. Naturally, upon birth, consciousness knows what the mental faculty requires it to do, and thus automatically and consciously acts according to the mental faculty's intentions. Inevitably, it cannot help but propose suggestions and opinions; sometimes it even holds its own views that conflict with the mental faculty's intentions, leading to internal contradictions and difficulty in making decisions when encountering situations.
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