Reverence to God, to the Scriptures, to the the tradition, and to God is good. It also helps for experiencing pleasure, to have a good feeling, a feeling of protection and of being blessed. But the main purpose of a Guru is to help to overcome the ego of the disciple. The disciple must understand this – and agree to it. Only then a Guru-disciple-relationship is possible. Devotion to Guru and God is important – but to put the spiritual teachings into practice is most important. Allow God and Guru to work through your body and mind – allow God and Guru to mould you.
This is the essence of this talk by Swami Atmaswarupananda at Sivananda Ashram Rishikesh February 2014. http://www.sivanandaonline.org, http://www.yoga-vidya.org