Again, I would like to start by giving part of a definition of miracles that comes from my church:
"Christianity is founded on the greatest of all miracles, the resurrection of our Lord. If that be admitted, other miracles cease to be improbable."
C.S. Lewis starts chapter XIV by promoting a different miracle as the greatest of all:
"The central miracle asserted by Christians is the Incarnation. They say that God became Man. Every other miracle prepares for this, or exhibits this, or results from this."
However, I think that the two are similar enough that Lewis' discussion will still hold some jewels of merit for us. Lewis maintains that miracles are not "arbitrary interferences" or "disconnected raids", but
"the various steps of a strategically coherent invastion - an invasion which intends complete conquest and "occupation." The fitness, and therefore credibility, of the particular miracles depends on their relation to the Grand Miracle; all discussion of them in isolation from it is futile."
In other words, all miracles are in some way connected to the
condescension of God. Lewis would I think definitely agree with the last sentence of the LDS definition given above: "If that [the resurrection] be admitted, other miracles cease to be improbable."