Namaskara Yoga

You will have no progress in this Yoga if you treat others contemptuously. Lord Krishna taught the Namaskar Yoga to Uddhava. When you are egoistic, you cannot do Namaskar to everybody! Such egoistic people cannot practise Karma Yoga. You must bow to everybody! for in everybody the In-dweller is God. In order to make him understand the secret of developing humility, Lord Krishna asked Uddhava to prostrate to donkeys and dogs. For, in them too, dwells the Omnipresent Lord. Such are the practices that would enable the Karma Yogi to develop humility, a very very important virtue which every aspirant should possess in abundance.

Source: pg 305, Yoga-Samhita by Swami Sri Sivananda