Imam Ali (AS) said, When you want to benefit from knowledge then act upon it and increase in your contemplation about its meanings, [for through this] it will be retained by the hearts.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : إذا رُمْتُمْ الاِنْتِفاعَ بِالْعِلْمِ فَاعْمَلُوا بِهِ وَ أكْثِرُوا الفِكْرَ في مَعانيهِ تَعِهِ القُلُوبُ