Whoever applies what he learns is granted knowledge of things that they do not know.

 

Some Salaf (righteous predecessors, may Allah be pleased with them), said, 

“Whoever applies what he learns is granted knowledge of things that they do not know.”

Allah (Glorified be He) states,  While as for those who accept guidance, He increases their guidance and bestows on them their piety. (Surah Muhammad 47:17)

Source: https://alifta.gov.sa