SB 3.26.22

svacchatvam avikāritvaṁ
 śāntatvam iti cetasaḥ
vṛttibhir lakṣaṇaṁ proktaṁ
 yathāpāṁ prakṛtiḥ parā
Synonyms: 
svacchatvam — clarity; avikāritvam — freedom from all distraction; śāntatvam — serenity; iti — thus; cetasaḥ — of consciousness; vṛttibhiḥ — by characteristics; lakṣaṇam — traits; proktam — called; yathā — as; apām — of water; prakṛtiḥ — natural state; parā — pure.
Translation: 
After the manifestation of the mahat-tattva, these features appear simultaneously. As water in its natural state, before coming in contact with earth, is clear, sweet and unruffled, so the characteristic traits of pure consciousness are complete serenity, clarity, and freedom from distraction.
Purport: 

The pure status of consciousness, or Kṛṣṇa consciousness, exists in the beginning; just after creation, consciousness is not polluted. The more one becomes materially contaminated, however, the more consciousness becomes obscured. In pure consciousness one can perceive a slight reflection of the Supreme Personality of Godhead. As in clear, unagitated water, free from impurities, one can see everything clearly, so in pure consciousness, or Kṛṣṇa consciousness, one can see things as they are. One can see the reflection of the Supreme Personality of Godhead, and one can see his own existence as well. This state of consciousness is very pleasing, transparent and sober. In the beginning, consciousness is pure.