The occupational activities a man performs according to his own position are only so much useless labor if they do not provoke attraction for the message of the Personality of Godhead.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
धर्मः स्वनुष्ठितः पुंसां विष्वक्सेनकथासु यः । नोत्पादयेद्यदि रतिं श्रम एव हि केवलम्
dharmaḥ svanuṣṭhitaḥ puṃsāṃ viṣvaksenakathāsu yaḥ | notpādayedyadi ratiṃ śrama eva hi kevalam
SB 1.2.8