CC Madhya 18.195

mokṣādi ānanda yāra nahe eka ‘kaṇa’
pūrṇānanda-prāpti tāṅra caraṇa-sevana
Word for word: 
mokṣa-ādi — liberation and so on; ānanda — transcendental bliss; yāra — whose; nahe — not; eka — even; kaṇa — a fragment; pūrṇa-ānanda-prāpti — attainment of completely blissful life; tāṅra caraṇa-sevana — service to His lotus feet.
Translation: 
“The happiness of liberation, whereby one merges into the Lord’s existence, cannot even be compared to a fragment of the transcendental bliss obtained by service unto the Lord’s lotus feet.