In ancient times, the sages and seers maintained purity in thought, truth in word and righteousness in deeds. But in this Kali Age today, people have forgotten human values and exhibit animal qualities such as lust, anger, greed and hatred. Purity of heart and selflessness are the hall-marks of the human life which one gets after passing through several births. Foolishness, pride, covetness and other such qualities are a hang-over from their previous lives as sheep, buffalo or cat. One who is in the habit of attacking and harming others out of hatred reveals the tendencies in his previous birth as a dog. One who lacks steadiness of mind and constantly jumps from one thing to another, reflects the quality of the monkey from which he has evolved. It is to get rid of such bad qualities that sacrifices are undertaken.
(Sanathana Sarathi, January 1994, pg 12)


