Karanabdhisayi Visnu (Maha-Visnu) is the first incarnation of the Supreme Lord, and He is the master of eternal time, space, cause and effects, the mind, the elements, the material ego, the modes of nature, the senses, the universal form of the Lord

Expressions researched:
"Kāraṇābdhiśāyī Viṣṇu [Mahā-Viṣṇu] is the first incarnation of the Supreme Lord, and He is the master of eternal time, space, cause and effects, the mind, the elements, the material ego, the modes of nature, the senses, the universal form of the Lord"

Sri Caitanya-caritamrta

CC Madhya-lila

Kāraṇābdhiśāyī Viṣṇu [Mahā-Viṣṇu] is the first incarnation of the Supreme Lord, and He is the master of eternal time, space, cause and effects, the mind, the elements, the material ego, the modes of nature, the senses, the universal form of the Lord, Garbhodakaśāyī Viṣṇu and the sum total of all living beings, both moving and nonmoving.

CC Madhya 20.267, Translation and Purport

“‘Kāraṇābdhiśāyī Viṣṇu [Mahā-Viṣṇu] is the first incarnation of the Supreme Lord, and He is the master of eternal time, space, cause and effects, the mind, the elements, the material ego, the modes of nature, the senses, the universal form of the Lord, Garbhodakaśāyī Viṣṇu and the sum total of all living beings, both moving and nonmoving.’

This is a quotation from Śrīmad-Bhāgavatam (SB 2.6.42). For an explanation, refer to Adi-līlā, Chapter Five, verse 83.