The Lady Tsogyal: From where do all that appears and exists, the phenomena of samsara and nirvana, first arise?
Padmasambhava: All that appears and exists, the phenomena of samsara and nirvana, arise from the solidified habitual tendencies of labeling. There are three types of labeling: mental labels, cognitive labels, and verbalized labels. Mental labels make thoughts move; cognitive labels build up habitual tendencies; and verbalized labels manifest the manifold objects. It would therefore be better if you stopped labeling.
from Descending with the View from Above