Chasidut zu Bereschit 42:23

Now, it is known that there is a world of pleasure, the world of Understanding; and when one speaks the speakings with joy and passion, with Love and Reverence, the pleasure comes to him afterward. For at the beginning he must exert himself in Service, which is his arousal and longing; and this is called “the World to Come,” which is to say that it comes always at the time of Service, whereas the future world is called “the Coming Future” in the Talmud. And “listening” connotes understanding as in the verse, that Joseph understood (Gen. 42:23); for without their needing to exert beforehand, it would not be considered Service, but merely a desire like any desire.