Much have I travelled in the realms of gold
And many goodly states and kingdoms seen;
Round many western islands have I been
Which bards in fealty to Apollo hold.
Oft of one wide expanse had I been told
That deep-browed Homer ruled as his demesne;
Yet did I never breathe its pure serene
Till I heard Chapman speak out loud and bold:
The “wide expanse”- sounds awe-inspiring, but in reality is empty and unrelatable.  Keats has only been “told” of it; his knowledge of “The deep-browed Homer” is second hand.