An Introduction to Tantric Buddhism c7.63

c7.63

which has been said to be the vehicle (*vāhana*) through which these impurities of nature (*prakṛti-doṣa*) function.¹ It has been said, wherever there is the (function of the ) bio-motor force or the vital wind, nature (*prakṛti*) with all her impurities is also brought along with it ; and so long as there is the function of this bio-motor force or the vital wind, the principles of impurity will not cease to function.² As the function of this vital wind goes on day and night, the principles of impurities also function always. In the Śūnya stage the *vāyu* remains mixed up with thought ; in the next stage thought predominates over this *vāyu* and the third stage is a mixture of both the previous stages. Though knowledge is pure consciousness and is of indeterminate nature like that of the sky, yet there are differences in knowledge as there are differences in the sky in twilight, night and day.³