Brihad Bhagavatamrta
Part 2 Chapter 1 Text 14

vaikuntham durlabham muktaih
sandrananda-cid-atmakam
niskama ye tu tad-bhakta
labhante sadya eva tat

TRANSLATION
That abode, Vaikuntha, is made of concentrated ecstasy and pure consciousness. Even for liberated souls it is difficult to attain. But the Lord’s devotees who are free from selfish desires reach it at once.