Our rabbis teach that we were created to perform a mission in this world so that we may enjoy the eternal bliss of the next. The task we are given is to serve Hashem from the exact place and circumstances in which He puts us. Every person receives a different life and a different set of conditions. If he fulfills the role Hashem sent him here to perform within those conditions, he will merit the delights of the World to Come. The Gemara teaches that no human eye has ever seen what the World to Come truly is — only Hashem knows its nature. When a person leaves this world, his soul enters Gan Eden, the world of souls, but Olam HaBa will only begin after the days of Mashiach. If we could imagine gathering the greatest pleasures ever experienced in this world since the beginning of time, compressing them into a single capsule, and a person were to swallow it, the joy he would feel at that moment would not even approach one second of the pleasure of Olam HaBa. This world is fleeting and its pleasures are finite. The World to Come is everlasting, and its pleasure never ends. Everything that Hashem does with a person in this world is with both worlds in mind. Hashem wants us to have the ultimate eternal pleasure, and therefore He guides us here in the precise way needed to attain it. The Mesillat Yesharim describes the pleasure of the World to Come as the soul "basking in the radiance of the Shechinah." This is a spiritual delight beyond our comprehension, because we live in physical bodies. It is a closeness to Hashem so profound that the pleasure cannot be described. In His great love, Hashem even gave us ways to taste a faint semblance of that future bliss already in this world. The Chazon Ish wrote a sefer on Emunah and Bitachon that was not published during his lifetime. Some say this was because he did not want people to recognize the extraordinary heights of Emunah he had reached, which are evident from his writings. In that work he explains that when a person truly grasps the reality of Hashem's existence, he is immediately filled with a boundless inner jubilation. His soul becomes suffused with sweetness. He tastes the sweetness of Hashem, and his desire for physical pleasures begins to fall away, while his delicate neshamah becomes enveloped in holiness, almost as if it has separated from the body and risen to the highest heavens. A new world opens before him. It is possible for a person even in this world to have moments in which he resembles an angel and actually delights in the glory of Hashem. At such times, all the pleasures of this world are like nothing compared to the joy of cleaving to his beloved Creator. The Chazon Ish himself clearly experienced such moments. When a person internalizes the reality of Hashem's presence, he can already experience a taste of the eternal pleasures that await. The closer we draw to Hashem in this world and the more we cling to Him, the more pleasure we will experience — both here and in the next.