Read the this passage carefully and answer the question: I have returned safely home after my visit to you They little affair about which we spoke seriously...

Read the this passage carefully and answer the question:

I have returned safely home after my visit to you
They little affair about which we spoke seriously
Occupies my thoughts. How can I ever forget that
you have done me great honour? To show my
gratitude. I will guard the object of your interest....
with all the vigilance in my power......

'The object' of interest is