Srimad Bhagavatam: Canto 11, Chapter 07 – Lord Krishna Instructs Uddhava

06. From the tree, the brahmana learnt that

a)   One should dedicate himself to others
b)   One should devote his efforts for service of others
c)   One should not get entangled when in contact with the material objects
d)   One should be free from all contaminations