Read the following lines and answer the question :

The waves beside them danced; but they
Out-did the sparkling waves in glee:
A poet could not but be gay,
In such a jocund company:
I gazed-and gazed-but little thought

What wealth the show to me had brought:
For oft, when on my couch I lie
In vacant or in pensive mood,

They flash upon that inward eye
Which is the bliss of solitude;

And then my heart with pleasure fills,
And dances with the daffodils.

Find out a phrase from the above lines which means "in deep thoughts"

pensive mood