Source: Srimad Bhagavatham : Its Message for the Modern Man by Swami Shantananda Puri Maharaj
Srimad Bhagavatham (11:29:9)
कुर्यात् सर्वाणि कर्माणि मद्-अर्थं शनकैः स्मरन्
मय्य् अर्पित-मनश्-चित्तो मद्-धर्मात्म-मनो-रतिः
Whatever may be the activity you may be engaged in, always do it remembering the Lord and as a humble offering to Him.
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji
Lord Rama says, "Any accumulated wealth will dissolve in due time. Any position of power attained will come to an end. All the relations (children, wife) come to an end in death. There is nothing in this world that is permanent."