1574
Śrīmad-Bhāgavatam
[Canto 4, Ch. 31]
demigods;  arhaṇam —worship;  acyuta —of the Supreme Personality of Godhead;  ijyā —worship.
TRANSLATION
As pouring water on the root of a tree energizes the trunk, branches, twigs and everything else, and as supplying food to the stomach enlivens the senses and limbs of the body, so simply worshiping the Supreme Personality of Godhead through devotional service automatically satisfies the demigods, who are parts of that Supreme Personality.
PURPORT
Sometimes people ask why this Kṛṣṇa consciousness movement simply advocates worship of Kṛṣṇa to the exclusion of the demigods. The answer is given in this verse. The example of pouring water on the root of a tree is very appropriate. In  Bhagavad-gītā  it is said:
śrī bhagavān uvāca 
  ūrdhva-mūlam adhaḥ-śākham 
  aśvatthaṁ prāhur avyayam 
  chandāṁsi yasya parṇāni 
  yas taṁ veda sa veda-vit
“The blessed Lord said: There is a banyan tree that has its roots upward and its branches down and whose leaves are the Vedic hymns. One who knows this tree is the knower of the  Vedas .” (Bg. 15.1)
This cosmic manifestation has expanded downward and the root is the Supreme Personality of Godhead. As the Lord confirms in  Bhagavad-gītā :
ahaṁ sarvasya prabhavo 
  mattaḥ sarvaṁ pravartate 
  iti matvā bhajante māṁ 
  budhā bhāva-samanvitāḥ
“I am the source of all spiritual and material worlds. Everything emanates from Me. The wise who perfectly know this engage in My devotional service and worship Me with all their hearts.” (Bg. 10.8)
Kṛṣṇa is the root of everything; therefore rendering service to the Supreme Personality of Godhead, Kṛṣṇa ( kṛṣṇa-sevā ), means automatically serving all the demigods. Sometimes it is argued that  karma  and  jñāna  require a mixture of  bhakti  in order to be successfully executed, and sometimes it is argued that  bhakti  also requires  karma  and  jñāna  for its