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It is worth mentioning, for future reference,
that the creative power
which bubbles so pleasantly in beginning a new book
quiets down after a time,
and one goes on more steadily.
Doubts creep in.
Then one becomes resigned.
Determination not to give in
and the sense of an impending shape
keep one at it more than anything.
Writing books is like a having a relationship - first comes daydreaming and euphoria, followed by continuous joy, followed by contentment, followed by occasional boredom paired with strong commitment. To me, the key here is strong commitment.
Trudge through the muck of revisions and the wait-time of querying. Keep molding and re-molding the "impending shape" of your MS until it becomes what it is meant to be. Then remain committed for the long haul.
What does your relationship with your MS look like right now?