When we consider that the Redemption is imminent, neither the darkness nor the difficulties of exile will disturb us from performing our divine service cheerfully.
The Redemption and the coming of Moshiach are not merely a future reward, but form an integral part of our present divine service. Without the belief and anticipation of Moshiach's imminent arrival, our divine service now would be lacking a dimension.
Anticipating Moshiach's arrival is beneficial in two ways:
Believing in and anticipating the coming of Moshiach is one of the principles of our faith. This includes the request and the demand that he come immediately, as (for example) in the thrice-daily prayers, "May our eyes behold Your return to Zion..."; or, "Speedily cause the scion of David Your servant to flourish, ...for we hope for Your salvation every day." Thus, by anticipating Moshiach's coming on a daily basis, you fulfill an important precept of the Jewish faith.
Furthermore, when we consider that the Redemption is imminent, neither the darkness nor the difficulties of exile will disturb us from performing our divine service cheerfully. Our service will then be perfect, being "redeemed" from all kinds of obstacles and hindrances, and thus foreshadowing the future Redemption. Indeed, it will be a foretaste of the Talmudic blessing, "May you in your lifetime behold your [share in the] World [to Come]."
Nevertheless, even though the belief in Moshiach might help us perfect our divine service while in exile, it is understood that this degree of perfection does not rule out our earnest anticipation of the ultimate Redemption. One's present experience of perfection is infinitely inferior to the perfect consummation that will reign at the time of the Redemption. This is true both in regards to the commandments which can be observed only when Moshiach comes, and likewise as regards the commandments which can also be observed today.