Bg 18.36

sukham tv idanim tri-vidham
srnu me bharatarsabha
abhyasad ramate yatra
duhkhantam ca nigacchati

Word for word: 
sukham — happiness; tu — but; idanim — now; tri-vidham — of three kinds; srnu — hear; me — from Me; bharata-rsabha — O best amongst the Bharatas; abhyasat — by practice; ramate — one enjoys; yatra — where; duhkha — of distress; antam — the end; ca — also; nigacchati — gains.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O best of the Bharatas, now please hear from Me about the three kinds of happiness by which the conditioned soul enjoys, and by which he sometimes comes to the end of all distress.

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
A conditioned soul tries to enjoy material happiness again and again. Thus he chews the chewed. But sometimes, in the course of such enjoyment, he becomes relieved from material entanglement by association with a great soul. In other words, a conditioned soul is always engaged in some type of sense gratification, but when he understands by good association that it is only a repetition of the same thing, and he is awakened to his real Krishna consciousness, he is sometimes relieved from such repetitive so-called happiness.