Praying in the synagogue enhances and intensifies the power of prayer. The sanctity of the synagogue elevates one’s prayer, and praying with the community gathered in the synagogue creates a power that cannot be achieved when praying alone at home.

Since prayers are so awesome and lofty…that the upper spiritual worlds are dependent on them, and the future redemption – may it come speedily in our day, amen – is also dependent on them, it is therefore proper to try and take care to pray in a synagogue. The synagogue is like the Temple, and is referred to as a “miniature Temple,” where the Divine Presence rests. A person can accomplish there through prayer ten times what he would be able to if he were to pray in his home. For there in the synagogue he will find two advantages [over prayer in his home]: the sanctity of the place and the many people assembled there. (Rabbi Yosef Ĥayyim, Ben Ish Ĥai, Year 1, Miketz)

The Rebbe of Munkatch, Rabbi Ĥayyim Elazar Shapira, author of Minĥat Elazar, was hospitalized toward the end of his life in a medical center in Budapest. On Friday, before Shabbat, he asked permission to have a minyan near his sickbed. The hospital administration did not grant permission, but the doctor in charge of his treatment decided to take responsibility and allow it, provided that the prayer would be done quietly.