Chandogya Upanishad 6.13.1

6.13.1

lavaṇam etad udake avadhāyātha mā prātar upasīdathā iti \
sa ha tathā cakāra \
taṃ hovāca \
yad doṣā lavaṇam udake avādhā aṅga tad āhareti \
tad dhāvamṛśya na viveda \\613.1\

‘Put this salt into water and then come to me in the morning.’ He did so. The father said to him, ‘Bring the salt, my child, which you put into water at night.’ Having searched for it, he did not find it, as it had completely dissolved. ‘My child, take a sip from the top of this water. How is it?’ ‘It is salt.’ ‘Take a sip from the middle. How is it?’ ‘It is salt.’ ‘Take a sip from the bottom. How is it?’ ‘It is salt.’ ‘Throw this water away and then come to me.’ He did so (and returned saying), ‘It is there always.’ The father said to him, ‘Dear boy, as you do not see what is present in this water though indeed it exists in it, similarly, (Being exists) indeed in this body.