“Because the water was so poisonous, the boys and cows became visibly affected immediately after drinking. They suddenly fell down on the ground, apparently dead. Then Krishna, who is the life of all lives, simply cast His merciful glance over them, and all the boys and cows regained consciousness and began to look at one another with great astonishment. They could understand that by drinking the water of Yamuna they had died and that the merciful glance of Krishna restored their life. Thus they appreciated the mystic power of Krishna, who is known as Yogeshvara, the master of all mystic yogis.” (Krishna, The Supreme Personality of Godhead, Vol 1, Ch 15)