Just as a peacock's eyes, call, feathers and all other limbs are beautiful, one should not condemn him for his ugly feet. (see the merits alone).
Just as Sandalwood is very fragrant and lotus flower very delicate, one should not bring to mind their demerit of the fact that a snake generally wraps itself around the sandalwood tree while a lotus flower has thorn on its stem.
Just as a mango is sweet and delicious but its kernal's bitterness should not be thought of.
Similarly one should take Guru's word and his sermons from everyone and everywhere. Everyone should be respected also. No one should be ever slandered and condemned for his demerit.