Service to Vaiṣṇavas is best

Since 1988, Śrīla Gurudeva has been a cardio-patient, so there have been so many restrictions on his food. However if someone were to bring some foodstuff for him, he would not consider whether it is good or bad for his heart condition. Consequently, they must first give it to me. I am very strict about Śrīla Gurudeva’s diet; I always see whether or not that food is good for his health. If it is good, I give it to him; otherwise not.

Later on, people would ask, “O Gurudeva, have you taken that food (prasāda) that I gave you?”

“What? When did you give me? Oh, Mādhava Mahārāja is not giving it to me, because he thinks it is not good for me. If milk will come, he will take the cream and give me only the milk. If yoghurt will come, he will churn the yoghurt and give me the buttermilk but he will keep the butter.”

Common people could not understand what Śrīla Gurudeva was saying about him getting only the milk and Mādhava Mahārāja getting the cream. Śrīla Gurudeva is explaining that he is performing bhajana and other hard labour, and he gives his disciples and followers the proper siddhānta and the essence of his realisation, like the cream of milk or the butter on top of the yogurt. In other words, the person who serves him will get only the best.

It is mentioned in Śrīmad-Bhāgavatam (10.13.3):

शृणुष्वावहितो राजन्न् अपि गुह्यं वदामि ते
ब्रूयुः स्निग्धस्य शिष्यस्य गुरवो गुह्यम् अप्य् उत

śṛṇuṣvāvahito rājann api guhyaṃ vadāmi te
brūyuḥ snigdhasya śiṣyasya guravo guhyam apy uta

O king, kindly listen to me attentively. The activities of the Supreme Lord are very confidential, but I shall tell you about them, for the guru explains to a submissive disciple even topics that are extremely confidential and very, very difficult to understand.

It is further stated in Śrīmad-Bhāgavatam (1.1.8):

वेत्थ त्वं सौम्य तत् सर्वं तत्त्वतस् तद्-अनुग्रहात्
ब्रूयुः स्निग्धस्य शिष्यस्य गुरवो गुह्यम् अप्य् उत

vettha tvaṃ saumya tat sarvaṃ tattvatas tad-anugrahāt
brūyuḥ snigdhasya śiṣyasya guravo guhyam apy uta

You are learned because your gurus have bestowed upon you all the confidential knowledge given to a polite and obedient disciple. Therefore you can tell us all you have learned from them.

Śrīla Gurudeva will reveal all the confidential secrets about bhajana to a disciple who is very polite, gentle, and loyal to him. In the same way, Śrīla Gurudeva is saying that he is giving all these things to Mādhava Mahārāja because of the nature of the service that his disciple is performing.