# A crucible is for silver and a furnace is for gold
"A crucible is used to refine silver and a furnace is used to refine gold". A metal is refined by heating it to a high temperature so that it melts and the impurities may be removed. See Proverbs 17:3.
# crucible
a container used for heating substances to very high temperatures
# furnace
an oven that can be made extremely hot
# a person is tested when he is praised
"when one praises a person, they are also testing that person"