Hawzah News Agency - A number of our people has narrated from Ahmad ibn Muhammad in a mursal manner that Abu ‘Abdillah (al-Sadiq)  said:

دِعَامَةُ الانْسَانِ الْعَقْلُ وَالْعَقْلُ مِنْهُ الْفِطْنَةُ وَالْفَهْمُ وَالْحِفْظُ وَالْعِلْمُ وَبِالْعَقْلِ يَكْمُلُ وَهُوَ دَلِيلُهُ وَمُبْصِرُهُ وَمِفْتَاحُ أَمْرِهِ فَإِذَا كَانَ تَأْيِيدُ عَقْلِهِ مِنَ النُّورِ كَانَ عَالِماً حَافِظاً ذَاكِراً فَطِناً فَهِماً فَعَلِمَ بِذَلِكَ كَيْفَ وَلِمَ وَحَيْثُ وَعَرَفَ مَنْ نَصَحَهُ وَمَنْ غَشَّهُ فَإِذَا عَرَفَ ذَلِكَ عَرَفَ مَجْرَاهُ وَمَوْصُولَهُ وَمَفْصُولَهُ وَأَخْلَصَ الْوَحْدَانِيَّةَ لله وَالاقْرَارَ بِالطَّاعَةِ فَإِذَا فَعَلَ ذَلِكَ كَانَ مُسْتَدْرِكاً لِمَا فَاتَ وَوَارِداً عَلَى مَا هُوَ آتٍ يَعْرِفُ مَا هُوَ فِيهِ وَلايِّ شَيْ‏ءٍ هُوَ هَاهُنَا وَمِنْ أَيْنَ يَأْتِيهِ وَإِلَى مَا هُوَ صَائِرٌ وَذَلِكَ كُلُّهُ مِنْ تَأْيِيدِ الْعَقْلِ.

“Intelligence is the support for man. From intelligence come intelligence, understanding, memorization and knowledge and with intelligence he gains perfection. Intelligence is his guide, his instructor and the key to his affairs. When his intelligence is supported with light he becomes a scholar, a keeper (of knowledge), an intelligent re-caller and a man of understanding. Through intelligence he learns the answer to how, why and where or when. He learns who helps and who harm him. When he learns these (facts) he learns the channels, the connections and the differentiating factors. He then establishes pure faith in the oneness of Allah and acknowledges the need to obey Him. When he does so he finds the proper remedy for what he has lost and the right approach to whatever may come in. He knows well his present involvement, for what reason is he here, wherefrom has he come and to what end is he going. He will have all these because of intelligence.”

Al-Kāfi, v.1