Need help for a poem

I need a analyse for these lines to understand clearly :

That church and pray'r, and holy Sunday
Were no excuse for sinful Monday;

Thinking in this uncommon mode,
So out of all the priestly road,
What man alive can e'er suppose,
Who marks the way Preferment goes,
That she should ever find her way
To this poor curate's house of clay?

Such was the priest, so strangely wise!
He could not bow — how should he rise?
Learned he was, and deeply read,
But what of that? — not duly bred.

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Need help for a poem