One verse

Srimad Bhagavatam 3.28.10

3.28.10

मनोऽचिरात्स्याद्विरजं जितश्वासस्य योगिन: । वाय्वग्निभ्यां यथा लोहं ध्मातं त्यजति वै मलम् ॥ १० ॥

mano ’cirat syad virajam jita-svasasya yoginah vayv-agnibhyam yatha loham dhmatam tyajati vai malam

manah
the mind
acirat
soon
syat
can be
virajam
free from disturbances
jita-svasasya
whose breathing is controlled
yoginah
of the yogi
vayu-agnibhyam
by air and fire
yatha
just as
loham
gold
dhmatam
fanned
tyajati
becomes freed from
vai
certainly
malam
impurity.

The yogis who practice such breathing exercises are very soon freed from all mental disturbances, just as gold, when put into fire and fanned with air, becomes free from all impurities.