If you do not have sincerity, then it would be very difficult to see good qualities of others

We, students, always talk about the Guru: how good or how bad the Guru is and we usually don’t examine ourself. We think we are good but the Guru is bad (laughing). Because the Guru is bad, my practice doesn’t go anywhere, though I’m still good. This is our view, right? (laughing). Sometimes people are very strange, very ignorant, so sometimes they see a good lama or good teacher as a bad teacher, and a bad teacher, bad lama they see as a good [one]. So that’s ignorant. That’s very ignorant. And that may also be jealousy and dishonesty. Therefore, in particular, this sincerity is the most important among the three qualities of students. If you do not have sincerity, then it would be very difficult to see good qualities of others. Even when you do see someone is good, still you do not want to believe in them. Tsongkhapa, an emanation of Manjushri, a very famous scholar and very important practitioner, said: “Sincerity means not being best. If you are [best], then that will be an obstruction and you will not see the good qualities [of others]. And therefore, you will not realize the meaning of the teaching”. Basically, dishonesty is a very strong cause for not seeing good qualities of others. Jealousy and dishonesty – these bad emotions – can [make us] perceive things in an ugly way, incorrect way.

Hungkar Dorje Rinpoche, “Guru Yoga: The Practice of Pure View”