قال رسول الله صلي الله عليه و سلم ،، من عمل بما علم ورثه الله علم ما لم يعلم - Al-Ghazali

العبادةَ ثمرةُ العلم ، وفائدةُ العمر ، وحاصل العبدِ ، وبضاعةُ الأولياءِ ، وطريقُ الأقوياءِ ، وقسمةُ الأعزةِ ، ومقصدُ ذوي الهمَّةِ ، وشعارُ الكرامِ ، وحرفةُ الرجالِ ، واختيارُ أولي الابصارِ ، وهي سبلُ السَّعادةِ ، ومنهاجُ الجَّنةِ

O youth.......be assured that knowledge alone does not strengthen the hand......Though a man read a hundred thousand scientific questions and understood them or learned them, but did not work with them — -They do not benefit him except by working.....Knowledge is the tree, and working is its fruit; and though you studied a hundred years and assembled a thousand books, you would not be prepared for the mercy of Allah the Exalted except by working.

According to Ibn ‘Abbās, may God be pleased with him and his father, the Prophet David, God bless him and give him peace, used to say in his intimate Prayers: ‘My God, who inhabits Your House? And from whom do you accept the Prayer?’ Then God told him by inspiration: ‘David, he who inhabits My House, and he whose Prayer I accept, is none but he who is humble before My Majesty, spends his days in remembrance of Me and keeps his passions in check for My sake, giving food to the hungry and shelter to the stranger and treating the afflicted with compassion. His light shines in the sky like the sun. If he invokes Me, I am at his service. If he asks of Me, I grant his request. In the midst of ignorance, I give him discernment; in heedlessness, remembrance, in darkness, light. He stands out among ordinary people as Paradise towers over earthly gardens, its rivers inexhaustible and its fruits not subject to decay.