Daily Reading: Caitanya Caritamrita page-90

CC Ādi 3.5

pūrṇa bhagavān kṛṣṇa vrajendra-kumāra
goloke vrajera saha nitya vihāra

Translation: 

Lord Kṛṣṇa, the son of the King of Vraja, is the Supreme Lord. He eternally enjoys transcendental pastimes in His eternal abode, Goloka, which includes Vrajadhāma.

Purport: 

In the previous chapter it has been established that Kṛṣṇa, the son of Vrajendra (the King of Vraja), is the Supreme Personality of Godhead, with six opulences. He eternally enjoys transcendentally variegated opulences on His planet, which is known as Goloka. The eternal pastimes of the Lord in the spiritual planet Kṛṣṇaloka are called aprakaṭa, or unmanifested, pastimes because they are beyond the purview of the conditioned souls. Lord Kṛṣṇa is always present everywhere, but when He is not present before our eyes, He is said to be aprakaṭa, or unmanifested.

CC Ādi 3.6

brahmāra eka dine tiṅho eka-bāra
avatīrṇa hañā karena prakaṭa vihāra

Translation: 

Once in a day of Brahmā, He descends to this world to manifest His transcendental pastimes.

CC Ādi 3.7

satya, tretā, dvāpara, kali, cāri-yuga jāni
sei cāri-yuge divya eka-yuga māni

Translation: 

We know that there are four ages [yugas], namely Satya, Tretā, Dvāpara and Kali. These four together constitute one divya-yuga.