It is incumbent to await the coming of Moshiach every single day, and all day long... It is not enough to believe in the coming of Moshiach, but each day one must await his coming... Furthermore, it is not enough to await his coming every day, but it is to be in the manner of our prayer "we await Your salvation all the day," that is, to await and expect it every day, and all day long, literally every moment!(Torat Zev)
(L'Chaim)

To believe in the coming of Moshiach and to await it are two separate concepts.

"To believe" is a doctrinal affirmation as for any other part of the Torah: affirming the principle of the eventual coming of Moshiach, whenever that may be.

"To await" means an active and eager anticipation of the Redemption, that it occur speedily: "I await him every day..." literally.(From: "Moshiach", by Rabbi J.I. Schochet)
(L'Chaim)

"It was the custom of the Baal Shem Tov to partake of an extra meal on the last day of Passover. This meal was known as the "Meal of Moshiach," for on this day the radiance of Moshiach is openly revealed.

Partaking of this meal is intended to draw down the radiance of Moshiach in every aspect of one's daily life throughout the year.

Within every Jew there resides a spark of Moshiach. There is thus no Jew who does not have a connection with the revelation of the radiance of Moshiach, and with the festival meal held in his honor.(The Rebbe)
(L'Chaim)

"The world will be filled with the knowledge of G-d as the waters cover the ocean bed." The verse specifies "the world," and not merely the Jewish people. Hence, "The occupation of the entire world (including the gentile nations) will be solely to know G-d."(Likutei Sichot, vol. 23)
(L'Chaim)

Do not be amazed by the fact that Moshiach will be one of those who arise in the Techiya [Resurrection]. For this possibility was already considered by our Sages in Talmud Sanhedrin: Said Rav Asi, "If he is among the living he is like Rabbeinu HaKadosh. If he is among the dead, he is like Daniel Ish Chamudot."(Abarvanel in Yeshuot Meshicho p. 104)
(L'Chaim)

A person studying Torah or fulfilling a mitzva should be aware of the effect of his action. It should be clearly apparent that he is now sowing something that will lead to an ultimate sprouting -- the coming of Moshiach.(Likutei Sichot vol. 22)
(L'Chaim)

With the Melave Malka meal at the close of Shabbat, the Sabbath Queen is escorted on her way. This meal nourishes the luz bone, and from this bone the body will be reconstituted at the time of the Resurrection.(Prayerbook of Rabbi Yaakov Emden)
(L'Chaim)

An aerial view of a Jewish cemetery (known in Hebrew as "The Home of the Living") often discloses that the plots are arranged in such a way that the foot of each grave is directed towards the Holy Land so that the body of every departed Jew is laid to rest "as if ready to arise and go up to Jerusalem."(Gesher HaChaim vol. 1, p.138)
(L'Chaim)

A Jew who is steeped in "awaiting his coming every day" seeks the link of every mitzva and of every festival with the coming of Moshiach. For it is in the days of Moshiach that the true essence of every mitzva and of every festival will be fully revealed.(The Rebbe, Miketz, 5751)
(L'Chaim)

King David revealed in the Torah the aspect of Song [through his composition of the Book of Psalms]. And when Moshiach, the son of David, will come at the End of Days, all the peoples of the world will stream after him, and they will give to G-d the Crown of sovereignty.(Book of Our Heritage)
(L'Chaim)

While the darkness of earlier periods demanded less effort, the darkness of our days -- the generation which can hear the footsteps of Moshiach -- is growing deeper and denser. For the sublime and evasive sparks that still await retrieval can be redeemed only by the redoubled exertions that redoubled darkness elicits. Indeed, the all- pervasive darkness is a reassurance that the last traces of these sparks are now being rescued from the clutches of the forces of impurity. The end of our generation's task is already within sight.(From Exile to Redemption)
(L'Chaim)

Exile is associated with night -- darkness and concealment. It is only a temporary state leading to the era of the Redemption.(The Rebbe, 19 Sivan, 5751)
(L'Chaim)

"This is a great test that the Redeemer [Moses] is concealed... and so it will be at the time of our righteous Moshiach that he will be concealed after his revelation, as mentioned in the Midrash.(Chatam Sofer on the Torah, end of Shemot)
(L'Chaim)

"The 'only' difference between this world and the days of Moshiach is in respect to bondage of foreign powers." (Talmud Berachot 34b)

The Chozeh of Lublin explains: "'Only' is to be taken literally in this passage as in others. It should, however, be understood thus:

The difference in what Jews have now and what they will not have under Moshiach is only in regard to foreign domination.

This we have now and will not have in the Messianic age.

Yet the difference between what we Don't have now, but will have when Moshiach comes is very great indeed."
(L'Chaim)

"It is only our bodies which are in exile and subjugated to the gentile nations; our souls were never sent into exile or subjugation."
The Previous Rebbe after his release, on 12 Tammuz, from Communist imprisonment.
(L'Chaim)

"Whoever quotes a concept in the name of its author brings Redemption to the world, as it is stated: 'And Esther told the king in the name of Mordechai.' "(Ethics 6:6)
(L'Chaim)

The entire history of humanity is a prelude to the era of Moshiach, the result of close to six millennia of man's efforts in developing and bringing to light the inherent goodness and perfection of this world. The world of Moshiach is a world free of hatred, jealousy and suffering, a world suffused with wisdom, a world in harmony with itself and its Creator.(Beyond the Letter of the Law by Yanki Tauber)
(L'Chaim)

Our Sages related (Jerusalem Talmud, Berachot 2:4) that Moshiach was born on Tisha B'Av. This is not merely a description of past history. On the contrary, the intent is that every year, Tisha B'Av generates a new impetus for the coming of the Redemption.(The Rebbe, Tisha B'Av, 5751-1991)
(L'Chaim)

There is a connection between the ultimate Redemption and the holiday of Sukkot. For at that time, we will benefit from the Sukka made from the skin of the giant fish, the Leviathan. In the Redemption, the oneness of the Jewish people -- a concept which is true at all times -- will be openly revealed and we will see how "all Jews are fit to dwell in a single Sukka."(The Rebbe, 4th day of Sukkot, 5752)
(L'Chaim)

Moshiach will delight in the company of unscholarly, self-sacrificing Jews. A unique chamber will be set aside for them, and they will be envied by the greatest of intellectuals.
(Rabbi Menachem Mendel of Lubavitch, the Tzemach Tzedek)
(L'Chaim)