Just as a camphor and salt being white look alike, petals of saffron and safflower (Carthamus tinctorious) being red, look the same.
Just as silver and bronze shine alike, collyrium and incense stick ash mixed with oil have the same blackness.
Just as colocynth (Tuma) and mango both being yellow look alike, a diamond and a marble bear the same hue.
Similarly, in the eyes of a foolish person, good and bad men are seen the same, but one who is a knowledgeable person with Guru's teachings, knows how to separate milk from water like a swan. He has the ability to distinguish between a saint and a sinner.