Devotion, along with humility and compassion, is one of the greatest tools and biggest allies on the Tantric path. The Manthanabhairavatantra Siddhakhandah declares:
Devotion (is of three kinds, namely, devotion) to the Transmission, devotion to the teacher, and devotion here to the teaching itself. Devotion is power and the Transmission is transmitted by power. Speech is transmitted from the Transmission and the Command operates by Speech. Devotion is liberation that beholds the end of the Transmental.
– MBT, SKh 4:36-7. Translated by M. Dyczkowski.
There is a lot going on in this statement – but what I want to focus on is the necessity of devotion on the Tantric path.