Riddle 95

I am noble,
and to men known,
and rest often
with high and low,
among people noted :
I go far,
and to me strangers before
friends stand,
a hope more joyous,
if I shall have
prosperity in cities,
or bright good.
Now prudent men
most love
my society.
I to many shall
wisdom make known :
there words speak not
any on earth,
though now the children of men,
land-dwellers,
my traces
eagerly seek :
I my track
sometimes conceal
from every man.