SB 3.7.19

yat-sevayā bhagavataḥ
 kūṭa-sthasya madhu-dviṣaḥ
rati-rāso bhavet tīvraḥ
 pādayor vyasanārdanaḥ
Word for word: 
yat — to whom; sevayā — by service; bhagavataḥ — of the Personality of Godhead; kūṭa-sthasya — of the unchangeable; madhu-dviṣaḥ — the enemy of the Madhu asura; rati-rāsaḥ — attachment in different relationships; bhavet — develops; tīvraḥ — highly ecstatic; pādayoḥ — of the feet; vyasana — distresses; ardanaḥ — vanquishing.
Translation: 
By serving the feet of the spiritual master, one is enabled to develop transcendental ecstasy in the service of the Personality of Godhead, who is the unchangeable enemy of the Madhu demon and whose service vanquishes one’s material distresses.
Purport: 

The association of a bona fide spiritual master like the sage Maitreya can be of absolute help in achieving transcendental attachment for the direct service of the Lord. The Lord is the enemy of the Madhu demon, or in other words He is the enemy of the suffering of His pure devotee. The word rati-rāsaḥ is significant in this verse. Service to the Lord is rendered in different transcendental mellows (relationships): neutral, active, friendly, parental and conjugal. A living entity in the liberated position of transcendental service to the Lord becomes attracted to one of the above-mentioned mellows, and when one is engaged in transcendental loving service to the Lord, one’s service attachment in the material world is automatically vanquished. As stated in Bhagavad-gītā (2.59), rasa-varjaṁ raso ’py asya paraṁ dṛṣṭvā nivartate.