In The Name of Allah, The Most Merciful, The Bestower of Mercy.

By Allah, one must strive (to attain) sincerity. Being overtaken by one’s soul, which results in a lack of sincerity to Allah, was the hardest thing that many scholars used to describe with grief. Your soul can overcome and divert you because you desire some fame and praise. One should exert himself, strive, and bear hardship to direct this soul to the truth- towards sincerity to Allah. “Verily, deeds are based on intention and every person will have what he intended.” So, whoever desires worldly gain through his knowledge or acts of worship, just as the one who migrated (from a land of kufr to a land of Islam) only to marry a woman and desires wealth, then he obtains nothing from his migration, except for that which he migrated. The thing desired is known to you, so you miss Allah’s reward”.

Marhaban Yaa Talib Al-Ilm’ page 122