Hevajra Tantra

From Joy there is some bliss, from Perfect Joy yet more. From the Joy of Cessation comes a passionless state. The Joy of Sahaja is finality.

The first comes by desire for contact, the second by desire for bliss, the third from the passing of passion, and by this means the fourth [Sahaja] is realized.

Perfect Joy is samsara [mystic union]. The Joy of Cessation is nirvana. Then there is a plain Joy between the two. Sahaja is free of them all. For there is neither desire nor absence of desire, nor a middle to be obtained.

In Sahaja there is neither insight nor skillful means, compared to the realization of correct reality. Sahaja cannot be explained by something else, nor is it found in anything. It is to be known intuitively by oneself, as a result of merit and through service and attendance on the teacher (guru).

Hevajra Tantra, possibly as early as 6th century