Vijnana Bhairava Tantra
161: One may give up even one's prana (life energy), but this teaching which is the supreme nectar should never be given up. The auspicious goddess said: O great Lord Shankara, God of gods, I am now fully satisfied.
162: Today I have understood the quintessence of Rudrayamala Tantra and also the heart (innermost core) of all the different shaktis.
163: Thus saying, the goddess being steeped in delight embraced Shiva.