No matter how much you study, you will be far from the straight path if you do not invoke God’s Name. And the more you study, the farther away will you go from it. If you become one who is most learned in the world, but it is not in the Name of God, you are then farthest away from God, the Blessed and Exalted! You will distance yourself from the straight path, at one end of which is the bridge of hell and with nature on one side and heaven on the other. The last stage is the divine epiphany [liqā’ Allāh]. It is where nobody except a human being can enter; only he can enter.
Sahifeh-ye-Imam. V 8. P 290
http://en.imam-khomeini.ir/en/n8313/The-Supplication-for-the-10th-Day-of-Ramadan