By this sentence the poet want to describe that the woman is married with the bride of quietness which is not a real marriage but a hypothetical. The bride is quiet, as she cannot speak because she is an image in the urn.

" Foster child of silence and slow time"

The child is foster because she is probably a very young lady, in her teens that it looks like she is a foster child. Silence is again used to describe that she can't speak and to show a figure of calm. Finally slow time is used to give the impression that time is passing very slowly.

" Heard melodies are sweet but those unheard are sweeter"

The point that Keats wants to make is that many people could look at the same

The urn conveys that human are mortal and that everybody is going to die. Only, this peace of world will stay in eternity. The urn will remain youthful through the time while the views will grow old with age and die.

What biographical note is there in the third stranza ?

What do you think is Keat's concept of beauty?

Some common words found in the essay are:
Bold Lover, ODE GRECIAN, happy love, bold lover never, foster child silence, never canst thou, lover never canst, canst thou kiss, canst thou, lover never, never canst, thou kiss, bold lover, foster child, child silence, biographical note, theme poem,
Approximate Word count = 510
Approximate Pages = 2 (250 words per page double spaced)