# 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"