Sufyaan al-Thawree (rahimahullaah) mentioned:
Verily, knowledge (of the deen) is sought so that (an person has) …
Learn Extra
http://piousmuslim.com/articles/gqvlokp-sufyan-al-thawree-on-what-distinguishes-knowledge-of-the-deen-from-all-various-kinds-of-knowledge.cfm