The secret of perfect health lies in keeping the mind always cheerful - never worried, never hurried, never borne down by any fear, thought or anxiety.
Desire destroys devotion, anger destroys wisdom, greed destroys work - hence these bad qualities must be sacrificed. With good and sweet words, keeping desires under check and control (for ultimate removal), one should start on the path of sacrifice.
Snakes hiss; pigs grunt; and bills moo! They are asserting their ego, intent on keeping others away. Of the traits of ego, pride is the most poisonous. But, the pride of the scholar and the vanity of Pundits are so thick, that it is impossible for them to get rid of these.