From the Diet of Worms to the Augsburg Confession - James Aitken Wylie

This magnanimous avowal was not without its
effect. It had evidently touched the hearts of the
opposing rank of doctors. Luther's prejudice and
obduracy were, it appeared, on the point of being
vanquished, and his coldness melted. Zwingli's
keen eye discovered this: he burst into tears– tears
of joy–seeing himself, as he believed, on the eve of
an event that would gladden the hearts of
thousands in all the countries of the Reformation,
and would strike Rome with terror. He approached:
he held out his hand to Luther: he begged him only
to pronounce the word "brother." Alas! what a
cruel disappointment awaited him. Luther coldly
and cuttingly replied, "Your spirit is different from
ours." It was indeed different: Zwingli's was
catholic, Luther's sectarian.
The Wittenberg theologians consulted together.
They all concurred in Luther's resolution. "We,"
said they to Zwingli and his friends, "hold the
belief of Christ's bodily presence in the Lord's
Supper to be essential to salvation, and we cannot
in conscience regard you as in the communion of
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