بسم الله الرحمن الرحيم

Shaykh Saalih Al Fawzaan was asked:

Is it better to devote oneself with seeking of knowledge or occupy oneself with trade (seeking after sustenance) ?

Answer:

There is no doubt there is nothing equal to the seeking of knowledge; however seeking knowledge does not prevent occupying oneself with trade (seeking after sustenance), evidently he seeks knowledge in its time and he occupies himself with trade (seeking after sustenance) in its time.

http://www.alfawzan.af.org.sa/node/12870