_Burke, Passage from._--The following passage is quoted as a motto _from
Burke_:--
"The swarthy daughters of Cadmus may hang their trophies on high, for
when all the pride of the chisel and the pomp of heraldry yield to the
silent touches of time, a single line, a half worn-out inscription,
remain faithful to their trust."
In what composition of Burke's is it to be found?