Wisdom of Paramahamsa yogananda.

On many occasions the swami was seen to drink, with no 
ill effect, the most deadly poisons. Thousands of people, including a few
 that are still living, have seen Trailanga floating on the Ganges. For
 days together he would sit on top of the water or remain hidden for very 
long periods under the waves. A common sight at Manikarnika Ghat was the 
swami’s motionless body on the blistering stone slabs, wholly exposed to
 the merciless Indian sun.

By these feats Trailanga sought to teach men that human 
life need not depend on oxygen or on certain conditions and precautions.
Whether the great master was above water or under it, and whether or not 
his body challenged the fierce solar rays, he proved that he lived by divine
 consciousness: Death could not touch him.

(.....)

“Master,” the materialist said, in mock reverence, “I
 have brought you some clabbered milk. Please drink it.”

Trailanga unhesitatingly drank, to the last drop, the
 quarts of burning lime. In a few minutes the evildoer fell to the ground
 in agony.

‘Help, swami, help!” he cried. ‘I am on fire! Forgive 
my wicked test!”

The great yogi broke his habitual silence. “Scoffer,”
he said, “you did not realize when you offered me poison that my life is
 one with your own. Except for my knowledge that God is present in my stomach,
as in every atom of creation, the lime would have killed me. Now that you 
know the divine meaning of boomerang never again play tricks on anyone.”

The sinner, healed by Trailanga’s words, slunk feebly 
away.

Source : https://beezone.com/current/yoganex.html