Hadith 31-296

وَبِإِسْنادِهِ عَنْ عَلِيِ‏ عَلَيْهِ السَّلامُ قالَ: العِلْمُ ضالَّةُ المُؤمِنِ.

According to the same documentation, on the authority of Ali (a.s.), “A believer seeks knowledge as hard as he would seek his lost ones.”