Lord Brahma said: My four sons Sanaka, Sanatana, Sanandana and Sanat-kumara, who were born from my mind, are your predecessors. Sometimes they travel throughout the material and spiritual skies without any definite desire

Expressions researched:
"Lord Brahma said: My four sons Sanaka, Sanatana, Sanandana and Sanat-kumara, who were born from my mind, are your predecessors. Sometimes they travel throughout the material and spiritual skies without any definite desire"

Srimad-Bhagavatam

SB Canto 3

Lord Brahma said: My four sons Sanaka, Sanatana, Sanandana and Sanat-kumara, who were born from my mind, are your predecessors. Sometimes they travel throughout the material and spiritual skies without any definite desire.

SB 3.15.12, Translation and Purport

Lord Brahma said: My four sons Sanaka, Sanatana, Sanandana and Sanat-kumara, who were born from my mind, are your predecessors. Sometimes they travel throughout the material and spiritual skies without any definite desire.

When we speak of desire we refer to desire for material sense gratification. Saintly persons like Sanaka, Sanātana, Sanandana and Sanat-kumāra have no material desire, but sometimes they travel all over the universe, out of their own accord, to preach devotional service.