muse over

muse over someone or something

to reflect or meditate on someone or something. We were just now musing over Sarah and the way she has changed. Tom is so strange. I was musing over his behavior just yesterday.
References in classic literature ?
They had the fine castle to live in, and they could cross the Rhine valley and muse over the stately ruin of Trifels besides.
In school I can look at her and muse over days departed.
You'd better muse over your lessons and sums," said Marilla, concealing her delight at this development of the situation.